Day 13

• Thread w/ links to discussion about nuances in CO2 meausurement @HuffmanLabDU

• Thread summarizing paper on history of erroneous droplet dogma history: "How did we get here: what are droplets and aerosols and how far do they go? A historical perspective on the transmission of respiratory infectious diseases" @jljcolorado

Day 12

• Thread on building a box fan filter with a circular fan @ughberta

Day 11

• Thread reminder on needing high CADR, not just high efficiency for air cleaning @CorsIAQ

• Slides on reducing disease transmission in schools @NjbBari3

Day 10

• 120 seconds to show how to make a DIY Corsi-Rosenthal Box air cleaner (by kids) @HaywardScoreCEO

• Thread on CO2 measurement @HuffmanLabDU

• Stages of grief re: airborne inhalation of aerosol disease @marwa_zaatari

Day 9

• Thread of 13 airborne/aerosol disease reviews @jmcrookston

Day 4

• Thread on new kid mask testing @linseymarr

Day 1

• Thread explaining why "better than HEPA" is a gimmick; how HEPA filters work @TySopko

• Thread on what it means for a disease to be endemic @EpiEllie

Day 30

• Tweet with links to ASHRAE & others w/ figure of MERV efficiecy as fn of particle size @HuffmanLabDU

• N95s don't have to be expensive and can be reused @HuffmanLabDU

Day 28

• Corrected link for April Lancet commission on "Designing infectious disease resilience into school buildings through improvements to ventilation and air cleaning" @HuffmanLabDU

• Discussion on nuances of how to interpret CO2 measurements @Poppendieck

Day 27

• Thread showing calculation of per-person CO2 emission factors in a classroom @linseymarr

Day 26

• (Blog) Best Masks for Teachers in the Classroom @projectn95 (Courtney Sudhalter)

• Discussion on best practices to make hotel/motel stay as safe as possible Multiple, @marwa_zaatari

• Thread parallel to one above on making hotel/motel stay as safe as possible Multiple, @cathnoakes

• Thread on "Returning to on-site teaching" @trishgreenhalgh

Day 24

• Thread on new "Echoes Through Time" article of airborne disease history @HuffmanLabDU

• Electronic Air Cleaning Against COVID: Does It Work? AAAR

• Thread on making hospitals safer @mjb302

• The case for frequent recess + lunch outdoors: Leaving the classroom to get fresh air also helps to "flush-out" the classroom. @marwa_zaatari

Day 23

• Good idea to leave CO2 monitor in classroom to monitor ventilation / decay rate @ARISense_AQ

• Thread + comments chronicling mask efficacy in schools @LazarusLong13

Day 21

• Thread on examples of elastomeric respirators @LazarusLong13

Day 20

• Battling claims against masks being effective in the school classroom @jeremyphoward

Day 19

• Thread summary of informal survey of teachers about in-room air cleaners @MarcelHarmon1

Day 18

• Thread on inhalation dose @CorsIAQ

Day 17

• Posts from parents frustrated about being disallowed to bring CO2 sensor @HuffmanLabDU

• Posts from parents frustrated about being disallowed to bring CO2 sensor @kprather88

• Gif from USA Today article with visualization about flow in school classroom @JZarracina

• Updated thread on Air Cleaners Comparison @marwa_zaatari

Day 16

• Thread on gaslighting of kids wrt indoor school lunch @HuffmanLabDU

• IAQ Merit Badges to recognize Acts of Clean Air Kindness @ughberta

• Link to ASHRAE doc mentioning to disable demand-controlled ventilation (i.e. based on CO2) @HuffmanLabDU

• Link to CDC references to CO2 sampling + HEPA use @HuffmanLabDU

• Daughter frustrated about teachers eating outside at school, but kids not allowed @HuffmanLabDU

Day 15

• Thread with links to resources, articles, threads on kids' masks @HuffmanLabDU

Day 14

• Post + Twitter discussion on favorite high-quality masks @ErinSandersNP

• Post + Twitter discussion on favorite high-quality masks @HuffmanLabDU

• Short thread on kids & long-COVID @jljcolorado

Day 13

• (Blog) The one trick to make sure your child’s face mask fits properly, to comply with the brand new CDC recommendations. CoolMomPicks

Day 12

• Social distance, ballistic droplets, and aerosols: THE KEY ERROR (history, Chapin) @jljcolorado

• Collage of CR box pictures @kprather88

Day 11

• Plot of viral load over time helps to explain testing sensitivity @Michaelmina_lab

• Thread following update from CDC removing block on use of N95 (masks) @HuffmanLabDU

Day 10

• Tweet showing calculation of rebreathed fraction per CO2 concentration @Poppendieck

Day 9

• Airborne transmission of viruses: The comic version (via @chiawang8) @jljcolorado

• Tweet with screenshot + link to document how to calculate ACH (air exchange rate) @DavidElfstrom

• Thread on importance of eating outside at school @HuffmanLabDU

Day 8

• Short thread explaining #airborne precautions for a #layered approach of mitigation against #COVID19 @akm5376

• Data showing weak efficiency of battery-powered HEPA filters @marwa_zaatari

• Show us your favorite elastomeric respirator @Amal4Solutions

• Discussing asking about anyone loaning CO2 sensors out @HuffmanLabDU

• Various resources as intro for CO2 monitoring @HuffmanLabDU

Day 7

• Thread following Science Friday episode on air cleaners; 21 tweets of links @HuffmanLabDU

Day 6

• Irony/hypocrisy of schools that champion STEM but won't follow public health advice @HuffmanLabDU

• Thread pushing back against 'no evidence' for mask help in schools @meganranney

• Blog: The Relentless School Nurse: “I can’t take another minute of this”, is no Longer a Figure of Speech. @RobinCogan

Day 5

• Thread on risks of ozone as an indoor cleaning strategy @CorsIAQ

Day 2

• Updated air cleaner chart, now including box-fan filter @marwa_zaatari

Day 1

• Thread on Bangladesh mask study (650,000 participants) @Jabaluck

Day 29

• Thread about understanding ventilation, CO2 monitoring @CathNoakes

• Thread on estimating ventilation and filtration effectiveness in a classroom @Poppendieck

• Thread on importance of not taking off mask indoors @denise_dewald

• Add calling for school masks, vax, other efforts @hospitals4kids

• Thread on DIY, CorsiRosenthalBox pictures (collage) + lots of other info @kprather88

Day 28

• Examples of measuring CO2 in everyday places @RichardBarrow

Day 27

• Thread on questions to ask schools about airborne COVID safety (following CPR/Brundin article) @HuffmanLabDU

• Thread on "is COVID less severe than seasonal flu for kids?" @Prof_Lowe

• Thread related to not using ionizers, electronic air cleaners @MarcelHarmon1

• Conversation about need for more than 6 ACH for safety wrt Delta Multiple

Day 26

• Thread (long): Summarizing new Science review on airborne viruses + application, history @jljcolorado

Day 25

• Thread: Answers to what the different strategies will result in term of air change rate @marwa_zaatari

Day 24

• Thread with observations related to cases among children following new CDC data @DataDrivenMD

• Thread with links to short videos from #DeltaSchoolsAirborne event @joaquinlife

Day 22

• Results of optimizatio tests of box-fan filter air cleaners @DavidElfstrom

• Thread: COVID hits every organ @LazarusLong13

• Thread on difficulties of family discussions on sending kids to school @DataDrivenMD

• Single tweet recommendation of indoor plans for lunch @HuffmanLabDU

• Updated air cleaner chart, now including box-fan filter @marwa_zaatari

Day 19

• Thread on schools, COVID, HEPA, masks, lunch; following DP OpEd @HuffmanLabDU

Day 16

• Clip of video conference regarding fleeting, outdoor transmission of Delta in Australia @JOHNJOHNSTONED

• Thread of comments from a public health board meeting; instructive re: attitudes about school mask mandates @HuffmanLabDU

• Short public comment in favor of school mask mandates by an aerosol scientist @HuffmanLabDU

• Thread on outdoor spread/threat of COVID @LazarusLong13

Day 14

• Updated thread on which air cleaner to buy @marwa_zaatari

• Document w/ talking points in support of local school mask mandates @HuffmanLabDU

• (Blog) 24 Reasons & 144 Billion Delta Virus Particles To Take Delta VERY Seriously Stephen Douglas

Day 12

• Thread of links & threads on kids/childrens masks @HuffmanLabDU

• Chain of thoughts on frustrations as parent re: schools, COVID @HuffmanLabDU

• Why I recommend Flomask for kids (elastomeric respirator; mask) @LazarusLong13

• Loose thread on risks of indoor school lunch @HuffmanLabDU

Day 11

• Thread on rebreathed fraction of air, CO2 @CorsIAQ

• Thread on practicals of the Rosenthal-Corsi Box (DIY box-fan filter) @LazarusLong13

• Thread related to N95 masks and wildfire smoke, COVID @HuffmanLabDU

Day 10

• Thread on key mitigation strategies used to opening universities safely @CorsIAQ

Day 9

• Thread on key mitigation strategies used to keep UCSD & San Diego schools open, safe @kprather88

Day 8

• Motivation to care for indoor air quality @CorsIAQ

• Five tools for schools to operate safely @ashishkjha

Day 7

• Thread on kid/child masks @masknerd

Day 4

• Results of Intellipure air cleaner tets (non-HEPA units bought for NYC schools) @stephensbrent

Day 29

• Thread digesting leaked CDC document regarding Cape Cod Delta data @Bob_Wachter

Day 27

• Thread on why masks matter @meganranney

• Thread w/ audio clips from CDC announcement about masks (in schools and high transmission areas) @DrEricDing

• Announcement of new mask recommendations CDC

• (Blog) A Breath of Fresh Air: Outdoor Education in Pandemic Times & Beyond @MarcelHarmon1

Day 23

• Editable blog on Corsi-Rosenthal Box (Box-Fan-Filter) @__philipn__

Day 22

• Plans for Chicago Public Schools re: COVID plans for fall @ChiPubSchools

• Thread with thoughts about nuances of #VaxxedAndMasked discussion @HuffmanLabDU

Day 16

• Short thread on retraction of Walach et al. paper @jeremyfaust

Day 15

• Tweet + link to 1968 paper showing evidence HEPA filtration works @kprather88

• Thread on "colossal mistake" of Philadelphia schools installing poor HEPA cleaners @WaringIAQ

Day 14

• Thread with practical tips about using a CO2 sensor for ventilation monitoring @CathNoakes

Day 13

• Thread summarizing letter from National Nurses United to CDC about requiring masks @HuffmanLabDU

Day 12

• Thread w/ comments on new CDC guidance for schools @j_g_allen

• Thread on how necessary (or not) fit-testing N95 masks @claire_horwell

Day 11

• LONG THREAD on masks (82 tweets) @trishgreenhalgh

• Thread thinking about air recirculation @Don_Milton

Day 7

• Link to comment in response to Walach et al. paper on CO2-mask danger for kids @HuffmanLabDU

Day 6

• Link to comment in response to Walach et al. paper on CO2-mask danger for kids @HuffmanLabDU

Day 3

• Thread in response to Walach et al. paper on CO2-mask danger for kids @linseymarr

• Thread in response to Walach et al. paper on CO2-mask danger for kids @j_g_allen

Day 2

• Thread on MMWR report by Lindsley et al. on HEPA air cleaners @HuffmanLabDU

• Thread in response to Walach et al. paper on CO2-mask danger for kids @SabiVM

Day 1

• Thread showinig results of ionizer use in university classroom @linseymarr

Day 29

• Graphic showing differences between FFP2/FFP3/N95 @HuffmanLabDU

Day 28

• Use of airborne precautions for covid-19 in healthcare settings Multiple-author Blog

• Thread on Cambridge study on protecting HCWs with FFP3 masks @mjb302

Day 27

• Link to GoFundMe support for HEPA air cleaners in India Multiple

Day 26

• Thread reflecting on changes in WHO mask guidance, stopping transmission @ErinSandersNP

Day 25

• Thread about air quality in schools, following article about NYC buying HEPA for all classrooms @HuffmanLabDU

• Blog: Covid-19 is airborne, so what needs to happen next? @microlabdoc

• Tweet about HEPA in NYC classrooms + brief cost analysis @CorsIAQ

• Thread on ventilation in schools @marcelharmon1

• Thread about raising support for CO2 monitors in SE Asia -- and good background on CO2 monitoring @jljcolorado

Day 24

• Thread with links to many articles on aerosols studies of music/instrument/band performance & practice @HuffmanLabDU

• Tweet + discussion about masks for kids @kprather88

Day 23

• Thread, article, and discussiona about pollen as a carrier for SARS-CoV-2 @HuffmanLabDU

• Thread on the importance of 'why' airborne mitigation measures are important @HuffmanLabDU

Day 21

• Blog post on cleaning indoor air (focused specifically on wildfire smoke) @etgall

Day 20

• Thread summary of article about need to improve CDC process @LazarusLong13

Day 18

• Links to resources to file fraud claim w/ EPA about air cleaners @Parents4IAQ

• Tweet with links to several resources about air cleaner evaluations @linseymarr

Day 12

• Link to page chronicling changes in ICEG (Australia) guidance @kate_cole_

Day 11

• Tweet w/ links to story on school district that wasted money on wrong cleaners @marwa_zaatari

Day 7

• Do Air Cleaners work? What does it mean when I see 98% effective? @marwa_zaatari

Day 1

• Thread on the disconnect on messaging & understanding about airborne transmission @linseymarr

Day 24

• Short thread + webinar video about reducing COVID risk in schools @CorsIAQ

• Short video summarizing improvements in elastomeric respirators @PPEtoheros

Day 23

• Tweets about feedback cycle between Twitter and media @zeynep

Day 22

• Thread on measurements of ventilation in Texas schools @CorsIAQ

Day 20

• The essence of essential oils @marwa_zaatari

Day 18

• Thread on personal take on CDC & masks from perspectives as aerosol scientist, father (epiphany) @HuffmanLabDU

Day 14

• Thread supporting CDC guidelines on masks @MonicaGandhi9

• Thread about CDC guidelines on masks @zeynep

Day 13

• Thread on Science paper about paradigm shift related to ventilation @jljcolorado

• So: What exactly does the CDC's mask guidance mean? And should you trust it? @apoorva_nyc

• Thread: Not pleased with CDC mask guidance @DrEricDing

• Responses to CDC guidelines on masks (via Schitt's Creek gifs) @ViralCarmichael

• Ask NOT whether your school is going to open in the fall 5 days per week ... @marwa_zaatari

• Thread supporting CDC guidelines on masks @MonicaGandhi9

Day 12

• A proposal for a triangle-approach for respiratory disease transmission prevention @MonicaGandhi9

• Thread on viral load of emission, also as a function of time; relates to why airborne detection is challenging @vipintukur

Day 11

• Thread on ionizers in schools (following Mother Jones article) @DrEricDing

Day 8

• Links to various threads reflecting on CDC scientific brief @HuffmanLabDU

• Long thread on airborne + droplet history (101+ tweets) @jljcolorado

• Thread answering questions about personal choices he makes wrt inhalation risk & air quality @CorsIAQ

• Thread on inhalation dose @CorsIAQ

• The real cost of HEPA cleaners in school classrooms @CorsIAQ

Day 7

• Letter follow-up to CDC brief @kprather88

• Thread summarizing WHO, CDC updates + NYT article @zeynep

• Thread follow-up on sociological perspective on airborne transmission (following @zeynep article) @linseymarr

• Thread about CDC scientific brief on mechanisms of transmission @jljcolorado

• Thread follow-up on sociological perspective on airborne transmission (following @zeynep article) @CorsIAQ

Day 5

• To HEPA or not (HEPA comparison to bi-polar cleaners) @marwa_zaatari

• Graphic summarizing HEPA efficiency: HEPA vs cost @marwa_zaatari

Day 3

• Tweet comment on outdated WHO guidelines on HCW PPE @DavidElfstrom

• Thread on updates to COVID-19 aerosol transmission estimator @jljcolorado

Day 2

• Thread summary "Simple way to estimate the risk of indoor superspreading" @jljcolorado

Day 29

• Thread on preprint about history of 5 micron aerosol definition, etc @linseymarr

Day 27

• Thread on The Lancet report on healthy school buildings @j_g_allen

Day 26

• Thread on The Lancet report on healthy school buildings @HuffmanLabDU

Day 24

• Thread responding to backlash against Lancet paper @trishgreenhalgh

Day 23

• Discussion following statements about distance not mattering @zeynep

Day 22

• Comments on recent WHO statements about airborne COVID @mdc_martinus & @Iamgoingtosleep

Day 18

• Thread on R0 @jmcrookston

• Thread on school ventilation @marwa_zaatari

Day 17

• Thread summary of "Ten scientific reasons in support of airborne transmission of SARS-CoV-2" @jljcolorado

• Short thread on "close contact" spread @HuffmanLabDU

• Thread w/ infographics about COVID prevention in many countries @Orla_Hegarty

Day 16

• Thread following "Ten scientific reasons in support of airborne transmission of SARS-CoV-2" @akm5376

Day 15

• Thread by WHO leader referencing BMJ paper on airborne transmission @mvankerkhove

• Thread summary of "Ten scientific reasons in support of airborne transmission of SARS-CoV-2" @HuffmanLabDU

• Thread summary of "Ten scientific reasons in support of airborne transmission of SARS-CoV-2" @zeynep

• Sarcastic blog on useless air cleaners @JimRosenthal4

Day 14

• Tweet & link about fundraising page for "Parents Unite to Fund Independent Research on Electronic Air Cleaners" @marwa_zaatari

Day 13

• Dust may be an efficient matrix for environmental monitoring of SARS-CoV-2 MicrobeNet blog (Sarah Haines)

• Thread on 'low Secondary Attack Rate (SAR) and Reproduction Rate (R0)' argument @CPita3

• Thread summarizing indoor air risk tool available from NIST @Poppendieck

• "It's quite possible that ALMOST ALL respiratory viruses mostly spread through the air" @DKThomp

Day 12

• Short thread on modes of airborne transmission @kprather88

• Thread on reduced O2 by pregnant patients wearing masks @doctimcook

Day 11

• Thread summarizing Prof. Kim Prather presentation at airborne virus discussion/debate @CPita3

Day 10

• Thread on what "situationally airborne" means @akm5376

• Thread summarizing Prof. Kim Prather presentation at airborne virus discussion/debate @LazarusLong13

• "If Dr Conly is the benchmark, then we need his resignation." @rajah_mich

• Link to "Thomas Kuhn in “Structure of Scientific Revolutions”" @jljcolorado

• Discussion about ethics of RCTs Multiple

Day 9

• Thread summarizing Prather, Fisman, Conly discussion on airborne virus spread @DRTomlinsonEP

• Live-tweet thread of Prather, Fisman, Conly discussion on airborne virus spread @lisa_iannattone

• Last year, WHO ... @kprather88

• Thread discussing reduced O2 for pregnant women using N95s @caruzycki

Day 8

• Video example of large particles NOT settling (50+ micron pine pollen) @smogdr

Day 7

• Thread w/ various links to Prather, Fisman, Conly discussion on airborne virus spread @HuffmanLabDU

Day 5

• Thread summary of CO2 & indoor risk paper @jljcolorado

Day 4

• Lost of schools wasting money on ionization cleaners (update) @marwa_zaatari

Day 2

• Thread on airborne precautions @akm5376

Day 31

• Thread on updated UK statements about COVIDisAirborne @FreshAir_SPFT

• COVID "Myths" with Dr Stephanie Dancer Infection Control Matters Podcast

Day 30

• Thread on preprint reviewing "Respiratory aerosols and droplets in the transmission of infectious diseases" @HuffmanLabDU

Day 29

• Thread summarizing ventilation and CO2 build-up (following El Pais article) @jljcolorado

• Discussion about outdoor transmission of virus Multiple

• Graphic about exponential growth @Orla_Hegarty

Day 28

• Thread following 1-yr anniversay or WHO statement + more on airborne transmission @jljcolorado

Day 25

• Thread on Blueair air cleaner @marwa_zaatari

Day 21

• Table & thread comparing measles and COVID-19 (Great comparison table) @JenniferKShea

• Thread: A year ago, @WHO started propagating an enormous error ... @jljcolorado

• Framing 'airborne' discussion as semantic @dgurdasani1

• Thread on achieving appropriate ventilation rates @marwa_zaatari

Day 18

• Thread on actionable aspects of COVID being airborne @celinegrounder

• Thread on tackling air quality, health, and social justices via indoor and outdoor air @IAQWP

Day 17

• Conversation about UV-C and virus inactivation Multiple

• Lost of schools wasting money on ionization cleaners @marwa_zaatari

Day 16

• Thread on distance and dilution @akm5376

Day 15

• Cloth filtration experiment: February/March 2021 @AniaMitros

Day 13

• What air cleaner test reports don’t tell you @built_envi

Day 11

• Thread on airborne transmission & House sub-committee testimony @linseymarr

• Thread on using proving air cleaning technologies @CorsIAQ

Day 7

• Thread w/ perspective on airborne discussion from applied/aerosol science perspective @caruzycki

• Thread on airborne transmission (Spanish) @jljcolorado

Day 6

• Thread with comparison of sensors inside difference CO2 devices @citlanx

Day 4

• Nuance on 3 ft vs 6 ft distancing rules @linseymarr

Day 3

• Thread w/ links to many good airborne COVID videos & visualizations @jljcolorado

Day 2

• Thread on use of desk shields @smjevnikar

• Slide on short/long range spread & large droplet/small aerosol spread @linseymarr

Day 1

• Thread on AMMA & INDA letters to Biden Admin about masks @jljcolorado

Day 28

• Thread on airborne/aerosol spread (Spanish-language) @jljcolorado

• Thread on complications/caveats to using CO2 for indoor ventilation @Poppendieck

Day 27

• Blog post using PM sensor to measure ventilation rate @quant_Aq

Day 26

• Thread on updated "Ventilation in Schools and Child Care Programs" doc @HuffmanLabDU

Day 25

• Thread on hockey/ice rink aerosol study @YaleSPH

Day 19

• Thread on new ES&T paper on masks & protection factors @smogdr

Day 18

• Thread on adding HEPA to every school in the US @CorsIAQ

Day 17

• Two theories to explain why masks reduce severity of disease @MonicaGandhi9

Day 15

• Thread on CDC guidelines for schools, ventilation @j_g_allen

• Re: Immediate Action is Needed to Address SARS-CoV-2 Inhalation Exposure Open Letter, team

Day 14

• Thread on "Nebulizer-gate" @jljcolorado

Day 13

• Thread following CDC guidelines for K12 schools w/ links to ventilation, air filtration @polsiewski

• Thread on ventilation in schools @CorsIAQ

• Thread on CDC guidelines for schools @apoorva_nyc

• Thread on frustration following CDC guidelines @HuffmanLabDU

Day 12

• Opinion thread following CDC guidelines for K12 schools @CorsIAQ

• Thread following CDC guidelines for K12 schools @DrEricDing

• A false sense of security @PeterDiamandis

• Thread revealing issues with using plexiglass as primary barriers of defense @AirQ007

Day 11

• Thread on Curtius et al. paper and portable air filters @HuffmanLabDU

Day 10

• Thread following updated CDC guidance on upgraded mask quality + fit @AbraarKaran

• Thread following updated CDC guidance on upgraded mask quality + fit @DrEricDing

Day 5

• Thread on sociology of Twitter science @jljcolorado

• Thread on better masks @HuffmanLabDU

Day 3

• Thread on schools & COVID health @CorsIAQ

• Video clip + thread from @WHO admitting COVID is in the air @HuffmanLabDU

Day 1

• Thread related to air cleaners & room filtration with respect to indoor air quality and COVID health @DavidElfstrom

Day 31

• Thread on need to focus cleaning on air and not as much on surfaces (Spanish) @jljcolorado

Day 29

• Thread showing HEPA filtration as mask insert (DIY) @linseymarr

Day 28

• Definition of N95, KN95, KF94 (also FFP2 = European) masks @linseymarr & @smogdr

Day 27

• Mass balance calculations (for classroom) to CO2 concentrations @linseymarr

• Thread about arbitrariness of the 15-min guideline for indoor contact @akm5376

Day 26

• Thread w/ some details & template for rubber-brace for mask-fitting @linseymarr

Day 25

• Tweet with video of recent WHO meeting without masks @HuffmanLabDU

Day 23

• Thread w/ various articles on COVID-19 spread, implying airborne @orla_hegarty

Day 19

• Thread on several aerosol calculation models @HuffmanLabDU

Day 17

• webpage on "How To Create An Emergency Isolation Room" in your home, condo or apartment @healthyheating

Day 16

• Thread w/ miscellaneous evidence about airborne SARS-CoV-2 @AliNouriPhD

• Thread on multidisciplinary research in IAQ @CorsIAQ

• Link to fix the mask face-seal, brace @FixTheMask

Day 15

• Thread by climate scientist on sci-comm tips to deal with denialists @dougmcneall

Day 14

• Petition related to airborne spread wrt new COVID variants @Iamgoingtosleep

• Thread on answering "why" as a scientist @Poppendieck

Day 11

• Thread on likelihood of outdoor transmission @mugecevik

• Funding now avail in CA for schools to assess their ventilation and repair @ShellyMBoulder

Day 4

• Thread on history of airborne, TB, measles, Chapin @jljcolorado

• I'm on Team 'GET YOUR SHIT TOGETHER ... @j_g_allen

Day 31

• Thread on aerosol spread, ventilation, COVID transmission (by MD) @mdholte

Day 30

• Thread on need to focus on layered risk reduction, esp. b/c of poor vaccine roll-out @CorsIAQ

Day 30

• Stopping the spread of COVID-19_Discussions with Prof. Kimberly Prather (podcast from May) @kprather88

Day 29

• Thread on NIH study showing airborne virus could lead to more severe disease @AliNouriPhD

Day 28

• Thread on living room spread of COVID @darakass

• Picture of poster from 1920 about "Precautions against influenza" @orla_hegarty

Day 27

• Thread on humidity and airborne viruses @linseymarr

Day 25

• Thread on preventing workplace spread @CorsIAQ

Day 24

• Short thread on personal mistakes & suggestions wrt to gatherings @HuffmanLabDU

Day 21

• Thread on paper implicating air duct spread in high-rise building @AliNouriPhD

Day 18

• Podcast w/ Profs. Kim Prather + Linsey Marr (aerosols, public health, masks) EPIDEMIC podcast

Day 17

• Thread on paper showing differences in aerosol generation based on voice sounds @AliNouriPhD

• Overview of pre-Fall 2020 COVID aerosol risk model & planning (from July 2020) @HuffmanLabDU

• Thread associated with COVID aerosol risk modeling for university music classrooms @HuffmanLabDU

Day 15

• Open letter to Biden Transition Team about COVID Transmission in Schools @ShellyMBoulder

Day 13

• Thread on updated ventilation, air prevention guidance in Wales @hughes_eilir

Day 11

• Thread on airborne transmission @DrEricDing

Day 10

• Thread on air cleaners @jljcolorado

• Public comments to BVSD school district @ShellyMBoulder

• Visual summary of recent mask study @linseymarr

• Short thread on classroom ventilation & air cleaning @ShellyMBoulder

Day 9

• Thread/plea to stay the course w/ organized practical tips @CorsIAQ

Day 8

• A Conversation with Jose-Luis Jimenez ACS Central Science

• A historical timeline of infectious disease and aerosols @jmcrookston

• Aerosol timeline (wrt COVID in 2020) @jmcrookston

• Short thread w/ links to new CDC ventilation guidelines @HuffmanLabDU

• Tweet showing relationship of ACH w/ air turnover @ShellyMBoulder

• Debunking Myths About MERV, Air Filtration ASHRAE journal

• DIY CO2 Sensor for Schools TorreyInnovation

Day 7

• Thread on CO2 observations + instructions to meaure AER at home, school @HuffmanLabDU

• Eagle and chicken analogy for respiratory particles @jljcolorado

Day 6

• Doc w/ CO2 observations in home, school, car + instructions to measure AER at home @HuffmanLabDU

Day 5

• Short thread on importance of NDIR for CO2 measurements @jljcolorado

Day 4

• Thread about updated CDC guidance @apoorva_nyc

Day 3

• Video link to Dr. Tedros (WHO) in March saying COVID is airborne @Iamgoingtoslep + @mdc_martinus

• Short thread on CO2 measurements in classroom @jessica_bassett

• Gif visulaizations of CFD air movement in room (from Saarinen et al., PLOS ONE, 2015) @HuffmanLabDU

Day 2

• Thread following WHO Q&A @HuffmanLabDU

• Nested thread: importance of masks, layering, WHO @HuffmanLabDU + @CorsIAQ +

• Thread on Kwon et al. paper on 5-min exposure over 20 ft @AliNouriPhD

Day 1

• Effect of ventilation and filtration on viral infection in residences ASHRAE journal

• Thread summarizing Zuo et al. review paper on aerosol importance to COVID disease @AliNouriPhD

• Covid: the importance of good ventilation (with Profs. John Wenger and Orla Hegarty) RTE Radio 1

Day 30

• • Snip from discussion about droplets/aerosols (summarizing 3 routes for aerosols) @jljcolorado

Day 29

• • Comment on number of SARS-CoV-2 virons per hour (see discussion as well) @jksmith34

Day 27

• • Thread on near- and far-field aerosols @CorsIAQ

Day 26

• • Thread showing results of recent German aerosol calculator for indoor risk @QuentinLclrc

• • Thread summarizing droplet physics of respiratory particles @AndrewCAhn2

Day 25

• • Tweet opinion on future needs for indoor air health; schools @CorsIAQ & @j_g_allen

Day 23

• • Thread on mask study preprint (from Marr group) @linseymarr

Day 22

• • Aerosols with respect to human physiology @DrPieterPeach

• • Most COVID transmission by people without symptoms @jljcolorado

• • Tweet on modeling tool + communication about COVID discussion @DSiachames

• • Tweet on activity worksheets for children which include monitoring exercises for using IAQ devices @IAQWP

Day 21

• • Thread on Chapin and history of infectious aerosols @jmcrookston

Day 19

• • Thread on revisiting history of airborne trasmission @rkhamsi

• • Thread on rationale for mask-wearing @Prof_Lowe

Day 17

• • Thread on WHO outbreak @HuffmanLabDU

• • Thread on simple steps to ventilate, decreae aerosol risk indoors @polsiewski

• • Overview of Prof. Miller COVID work, tips, blogs, papers, etc. @ShellyMBoulder

• • Thread on modeling Thanksgiving aerosol risk @HuffmanLabDU

• • Overview of aerosol modeling results related to Thanksgiving / holiday meal gatherings @HuffmanLabDU

Day 16

• • Spanish translation of Weather Channel interview by Prof. Jose Jimenez @ulisesnemo

• • Thread of threads about airborne viruses @jmcrookston

Day 15

• • DIY Air Purifiers – Tests and observations (box fan-fiter) @JbcLiftec

Day 14

• • Thread on holiday gatherings @kprather88

Day 13

• • Thread by citizen scientist on CO2 for estimaging ACH @LongDesertTrain

Day 12

• • Thread on personal experiences from health care workers @Prof_Lowe

Day 9

• • Experts weigh in on how safe flying is right now (Podcast w. Prof. Richard Corsi) - Spreaker.com

  • Thread + twitter exchange about WHO, aerosols, droplets, confusion, & importance (click around) - Mix

Day 7

• WHICH FABRIC MASKS PROTECT US BEST AGAINST CORONAVIRUS? - @mariaitapia

Day 6

• Thread: Monitoring ventilation w/ CO2 uUpdate to the FAQs on Protecting Yourself from COVID-19 Aerosol Transmission) - @jljcolorado

Day 3

• Thread on source reduction (viral aerosol/droplet) - @CorsIAQ

Day 2

• • Thread + blog on poor ventilation in homes - @ShellyMBoulder

  • Thread on evolution of WHO statements on ventilation - @HuffmanLabDU

  • Citizens’ petition asking the WHO to clearly tell the world that COVID-19 is in the air! - @covidisairborne

Day 1

• Back of the envelope calculation on indoor aerosol spread - @CorsIAQ

Day 30

• • WHO video on ventilation - @ShellyMBoulder

  • Thread on study from May 2020 on WHO, ventilation, droplets - @jmcrookston

Day 29

• Thread on need for multidisciplinary research in COVID discussion - @HuffmanLabDU

• Thread on using aerosol models for COVID (response to El Pais backlash) - @jljcolorado

• The role of Aerosols in SARS-CoV-2 Transmission - Swiss national taskforce

Day 28

• Thread on steps by San Diego school district - @kprather88

Day 26

• Thread related to article on returning kids to school - @apoorva_nyc

Day 22

• • Podcast/Radio: Ask An Expert: How safe is indoor air? - @CorsIAQ

  • Thread on effectiveness of masks - @justin_hart

Day 21

• Thread summarizing CDC, ventilation, indoor air - @CorsIAQ

Day 17

• Thread following study re: RH, Temp & virus viability - @linseymarr

Day 15

• The modes of transission of SARS-CoV-2: What we know now & how to protect ourselves - @jljcolorado

• Thread on how to open schools in context of COVID - @ShellyMBoulder

Day 12

• Thread on rebreathed CO2 and air - @CorsIAQ

Day 7

• Steps for Reducing COVID Transmission - @CyrusMaher

• Thread on box fan cube + testing analysis - @JohnSemmelhack

Day 6

• Thread responding to CDC guidelines from 10/5 - @jljcolorado

• Letter to BV school district re: COVID safety - Day, McQueen, Miller

Day 4

• The pandemic in the air (interview with Dr. Richard Corsi) - The Open Mind podcast

Day 1

• Thread on discussion about aerosols/droplets/airborne words wrt covid transmission - @CorsIAQ

Day 27

• Safer Space In The Age Of Covid-19 - @WarkEnergy

Day 25

• Cloth Masks to reduce COVID19 transmission - @chasingcloudsCW

Day 21

• Evolution of CDC decisions on aerosolized COVID: June 16 -> Sept. 18 -> Sept. 21 - @HuffmanLabDU

Day 20

• Thread clarifying wording & importance of updated CDC guidance - @jljcolorado

Day 11

• • Using CO2 indoors to monitor infection risk - @jljcolorado

  • Episode 8: COVID and Indoor Air Quality - Shared Air podcast

Day 10

• Screenshot video of Prof. Marr from NASEM workshop: overview of aerosol transmission - @adamhamdy (@linseymarr)

Day 9

• Example of particle reduction by box fan + MERV filter - @HuffmanLabDU

Day 8

• Thread: Tips regarding CO2 sensing to measure ventilation, IAQ - @CathNoakes

Day 5

• Thread: Broad view of conversation on schools and 'risk' - @j_g_allen

Day 4

• • Thread on UV air disinfection technology (w/ link to detailed presentation on 2nd tweet) - @ShellyMBoulder

  • COVID-19 Indoor Safety Guideline; resource page - Martin Z. Bazant

Day 3

• • Some thoughts from active scientists on Twitter about COVID-19 by aerosol scientists and indoor air experts - @kprather88

  • Safely returning to interior spaces, Part 2 - DIY Box fan air filter - @melkops

Day 1

• • Thread on logical errors in discussion of how COVID-19 is transmitted - @jljcolorado

  • Tweet on face shields w/ visual & links - @linseymarr

Day 30

• Examples of CO2 profiles in classroms with different types of ventilation - @j_g_allen

Day 28

• Personal summary of NASEM workshop on airborne SARS-CoV-2 (see: #EnviroHealthMatters) - @UniversalMaski2

Day 26

• Lots of great discussion, live-tweeting from NASEM workshop on airborne SARS-CoV-2 - #EnviroHealthMatters

Day 24

• Thread on ventilation concerns - @DavidElfstrom

Day 22

• Thread on old measles papers/history related to current pandemic aerosol/droplet discussion - @jmcrookston

• Thread on ventilation in schools - @jonlevyBU

Day 17

• On the need for a **true multidisciplinary approach** to aerosol & droplet transmission (aka “the Godzilla thread”) - @jljcolorado

Day 13

• Tweet thread on dangers (air chemistry + health) of oxidizing air cleanering - @EarthMechanic

Day 10

• Tweet thread on aerosol and droplet spread (reasoning) - @jljcolorado

Day 7

• Tweet thread on air cleaners - @jljcolorado

Day 5

• Thread discussing opinions on transmission routes - @jljcolorado

Day 4

• Idea to correct WHO figure on aerosols - @jljcolorado

Day 3

• Follow-up on fan + HEPA/MERV filter - @jljcolorado

Day 2

• • Video on fan + HEPA/MERV filter - @smogdr

  • Some slides on classroom air quality - @CorsIAQ

Day 1

• Cheap fan + HEPA/MERV filter - @jljcolorado +

Day 30

• Discussion of JAMA article - @jljcolorado

• We urgently need to focus on ventilation - @zeynep

Day 29

• Link/comment about study: aerosol in - @ShellyMBoulder

Day 28

• Threat on re-opening schools - @j_g_allen

Day 27

• CO2 sampling devices - @ShellyMBoulder

Day 24

• Discussion about CO2 sampling in classrooms - @jljcolorado

Day 21 - June

• Thread on ventilation - @IAQinGWN

Day 5 - June

• Masking the Use of Masks - @ProfCharlesHaas

Day 29 - May

• Idea/hack to improve seal around your surgical mask - Design Boom

Day 18 - May

• Thread on ventilation - @IAQinGWN

Day 3 - May

• Schlieren imaging footage of a woman coughing, first without and then with a face mask. - @sciencephoto

Day 19 - April

• Petition to set national humidity guidelines - Dr. Stephanie Taylor

Day 30 - Mach

• Sneeze simulations - @marekkraft

Day 8 - Mach

• Thread on why soap works to kill coronaviruses - @PalliThordarson