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zeynep's profile
zeynep tufekci
zeynep tufekci
zeynep tufekci
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zeynep tufekciVerified account

@zeynep

Complex systems, wicked problems. Society, technology, science and more. @UNC professor. @NYTimes columnist. My newsletter is @insight: http://www.theinsight.org 

floating in a most peculiar way
theinsight.org
Joined August 2009

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    1. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Ben Adams

      Yes. Taking short-range aerosols plus superspreading seriously has implications for almost every aspect fighting COVID. Japan, which long took airborne transmission seriously, does contact-tracing differently (cluster-busting) exactly for this reason.https://twitter.com/bendadams/status/1288858770983006208 …

      zeynep tufekci added,

      Ben Adams @bendadams
      Replying to @zeynep
      thank you for this very clear and smart article. Did you consider whether this has implications for contact tracing? I thought it might but don't understand tracing protocols well enough to be sure.
      8 replies 81 retweets 384 likes
      Show this thread
    2. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Dr. Richard Corsi

      There is urgent need for practical guidance for schools and other indoor spaces. For now, see thread from an excellent scientist. Lack of official guidance means there is a lot of snake oil in this space. Basic HEPA filters work, though. See for details->https://twitter.com/CorsIAQ/status/1288739096148336642 …

      zeynep tufekci added,

      Dr. Richard Corsi @CorsIAQ
      16/ The activated carbon is harmless, but does little to remove particles & is usually insufficient in mass to remove VOCs/odors. Not needed. Remember, basics! Aim for a portable air cleaner with a HEPA filter & CADR (for smoke) > 300 cfm (see above)
      Show this thread
      4 replies 113 retweets 341 likes
      Show this thread
    3. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Shelly Miller, PhD

      Another expert with specific guidelines.https://twitter.com/ShellyMBoulder/status/1288327833799008257 …

      zeynep tufekci added,

      Shelly Miller, PhD @ShellyMBoulder
      (1/2) Are searching for an air cleaner? 1st, I recommend HEPA only for COVID risk mitigation indoors. Want to treat a 600 sq ft room? FYI an air cleaner with a CADR of around 400 cfm will give you 5 air changes of particulate-free air (assuming an 8 ft ceiling).
      Show this thread
      5 replies 62 retweets 218 likes
      Show this thread
    4. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Zackary Berger

      Yes, there is an excellent detailed spreadsheet with different places/scenarios (class/subway/campus) by @jljcolorado that the more engineering-oriented can play with. Make a copy, fill in orange boxes to get estimates: https://docs.google.com/spreadsheets/d/16K1OQkLD4BjgBdO8ePj6ytf-RpPMlJ6aXFg3PrIQBbQ/edit#gid=154529406&range=A159 …https://twitter.com/DrZackaryBerger/status/1288891458783715330 …

      zeynep tufekci added,

      Zackary Berger @DrZackaryBerger
      Replying to @zeynep
      Great article. Is there an app or web based risk estimation tool to help individuals assess building and ventilation risk? Yes, I know the government should be doing this, but *looks around*
      4 replies 72 retweets 236 likes
      Show this thread
    5. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      One implication: We should have found a way to honor John Lewis without endangering the many vulnerable people in that room. Hopefully they have high CADR HEPA filters or someone checked the ventilation specs. It's the speaker that's emitting the aerosols. https://twitter.com/Pinboard/status/1288881445876822017 …pic.twitter.com/YUdvntka4H

      6 replies 61 retweets 255 likes
      Show this thread
    6. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted POLITICOEurope

      Let me say this outright: This is unscientific, stupid and wrong. This is incredible. Six months in, how can we be this behind the science? This make so little sense that my head hurts. This is why focusing on the right science matters. h/t @MartynaAFoxhttps://twitter.com/POLITICOEurope/status/1288897647344889863 …

      zeynep tufekci added,

      POLITICOEuropeVerified account @POLITICOEurope
      In Amsterdam and Rotterdam, masks will be required in some busy streets — but not in shops, museums or restaurants. https://www.politico.eu/article/amsterdam-rotterdam-to-impose-mandatory-masks-in-crowded-streets/ …
      16 replies 147 retweets 523 likes
      Show this thread
    7. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      So, this is ridiculous. @Delta is trying to reassure me flying is safe by mentioning... Lysol! Disinfecting! But not mentioning the actually reassuring things: cabin air is recycled every few minutes; cleaned by HEPA filters that can remove viruses and is circulated vertically.pic.twitter.com/cg5aqWgxrq

      14 replies 94 retweets 481 likes
      Show this thread
    8. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Scienceflare

      Yes very much. I’ve been corresponding with Japanese experts and I have their documents going back to March. They’ve really been on the money. My piece has more on what Japan figure out to do because they took short-range aerosols seriously from the start.https://twitter.com/covidpath/status/1288863784358916097 …

      zeynep tufekci added,

      Scienceflare @scienceflare
      Replying to @edyong209 @zeynep
      It's interesting that Japan caught onto this quickly back in March with their 3 Cs thing. pic.twitter.com/lFLdG8Hqvr
      7 replies 83 retweets 301 likes
      Show this thread
    9. zeynep tufekci‏Verified account @zeynep 30 Jul 2020

      zeynep tufekci Retweeted Brian Bruce

      Thank you! Indeed, ventilation is a layer in the mitigation stack. But understanding the role of short-range aerosols and potential airborne transmission makes how we should do the rest clearer. https://twitter.com/brianbruce7/status/1289039672627396608?s=21 …https://twitter.com/BrianBruce7/status/1289039672627396608 …

      zeynep tufekci added,

      Brian Bruce @BrianBruce7
      Replying to @edyong209 @GreatDismal @zeynep
      This is a great and very important article. Particularly the idea of layering mitigation—Hand washing, sanitizing, masks, good ventilation — has a significant impact.
      2 replies 26 retweets 135 likes
      Show this thread
    10. zeynep tufekci‏Verified account @zeynep 31 Jul 2020

      Note to editors assigning COVID pieces. This is ~5K words, (Had another 1K on hygiene theater when @DKThomp scooped me with a great piece!). Overwhelming feedback: thank you for the details! Do let your writers go long and treat the reader as a partner.🙏 https://www.theatlantic.com/health/archive/2020/07/why-arent-we-talking-more-about-airborne-transmission/614737/ …

      7 replies 47 retweets 256 likes
      Show this thread
      zeynep tufekci‏Verified account @zeynep 31 Jul 2020

      zeynep tufekci Retweeted Rachel Barnhart

      Yes. When schools open, they need to focus on ventilation, masks and distancing/separation especially among the staff and the older students. A sensible level of cleaning high-touch surfaces is good, but ventilation/masks is key and not to be overlooked!https://twitter.com/rachbarnhart/status/1289245963773546500 …

      zeynep tufekci added,

      Rachel BarnhartVerified account @rachbarnhart
      East Irondequoit did a FAQ for parents and there is a lot on cleaning, but not a word about ventilation, except gym classes will be outside "limiting aerobic exertion." (Psst...open the windows on the bus!) @zeynep #ROC pic.twitter.com/JNSk127q7P
      10:15 AM - 31 Jul 2020
      • 63 Retweets
      • 189 Likes
      • Albert Cardona Dorthe Jensen @AtahualpaYO Andrew Anka Deborah Conway (she/her) Living Vibrantly The Meme Guy Chris Lancashire Amy Zimmer
      8 replies 63 retweets 189 likes
        1. New conversation
        2. zeynep tufekci‏Verified account @zeynep 1 Aug 2020

          People have been asking about germicidal UV lights for killing the virus in indoor spaces. It is a real tool, and hospitals use it, but I did not include that in the article because it is not something to try without calling in the experts. Real dangers. https://www.theatlantic.com/health/archive/2020/07/why-arent-we-talking-more-about-airborne-transmission/614737/ …

          8 replies 34 retweets 171 likes
          Show this thread
        3. zeynep tufekci‏Verified account @zeynep 1 Aug 2020

          zeynep tufekci Retweeted Tressie McMillan Cottom

          I’ve been looking for a good analogy to airborne vs sprayborne, and asked all the experts, and this may yet be the best (for people who go to hair salons!) 😄 This matters, because having the correct mental model can empower people to think through this.https://twitter.com/tressiemcphd/status/1289602987711582208 …

          zeynep tufekci added,

          Tressie McMillan CottomVerified account @tressiemcphd
          Don Milton’s examples of droplet differences are a little high class. If it helps anyone else, I find it useful to think of the difference between hair spritz and fine hair spray. If it’s L’Oréal Elnett we are screwed. If it’s Pump it Up we are less screwed. https://twitter.com/miketuritzin/status/1289093700132380674 …
          Show this thread
          4 replies 50 retweets 184 likes
          Show this thread
        4. zeynep tufekci‏Verified account @zeynep 1 Aug 2020

          zeynep tufekci Retweeted

          Exactly. Aerosols are like short-range mist—the closer you are to the person emitting it, the more exposure *but* under the right conditions (poorly ventilated indoors space), the mist can accumulate and even be pushed around by air currents beyond 6 feet. https://twitter.com/dylanhmorris/status/1289612851762667521 …

          zeynep tufekci added,

          This Tweet is unavailable.
          10 replies 50 retweets 188 likes
          Show this thread
        5. zeynep tufekci‏Verified account @zeynep 2 Aug 2020

          zeynep tufekci Retweeted Peter Staley

          So this happened! 👀 😄https://twitter.com/peterstaley/status/1289565286035750912 …

          zeynep tufekci added,

          Peter StaleyVerified account @peterstaley
          My morning text to #TonyFauci, which led to a call during his powerwalk. He said he'd share it w/ @CDCDirector (hopefully when Redfield comes up for air from licking you-know-whose you-know-what). An amazing article, @zeynep! A must-read for everyone: https://www.theatlantic.com/health/archive/2020/07/why-arent-we-talking-more-about-airborne-transmission/614737/ … pic.twitter.com/97iZYu1P36
          11 replies 40 retweets 420 likes
          Show this thread
        6. zeynep tufekci‏Verified account @zeynep 2 Aug 2020

          What it's like to be a woman writing about tech/science/society. Two things happened the same day, and one of them is random dude telling me I "clearly have no clue" about airborne spread, just after I wrote a ~5K article about it. No track record is ever good enough for women.🤷‍♀️pic.twitter.com/a0po2Pk24A

          11 replies 60 retweets 334 likes
          Show this thread
        7. zeynep tufekci‏Verified account @zeynep 3 Aug 2020

          Because of my piece on ventilation, I keep getting asked for practical advice. CDC and health authorities should update guidelines. But for individuals? I'd say avoid Japan's 3Cs: closed spaces, crowded places, close-range conversations. And wear masks. https://www.theatlantic.com/health/archive/2020/07/why-arent-we-talking-more-about-airborne-transmission/614737/ …pic.twitter.com/w9lnPVUhDB

          8 replies 211 retweets 469 likes
          Show this thread
        8. zeynep tufekci‏Verified account @zeynep 3 Aug 2020

          Pandemic theater. Broncos players are coming out of an *indoors* locker room, to pant at each other at close range, but not before being sprayed by, uh, mumbo-jumbo nano-crystalline disinfectants!. (Do more! Activate the holosensors! Use positronic beams too!) 🙄 ht @benjiwadepic.twitter.com/gv7bNmDNjn

          14 replies 105 retweets 483 likes
          Show this thread
        9. zeynep tufekci‏Verified account @zeynep 3 Aug 2020

          I mean if we’re going to do pandemic theater, at least let’s do it right, with some elegance amd history. My grandmother would’ve put an evil eye charm on all of them. 🧿 Tradition > technobabble.pic.twitter.com/A2mi6dnaXK

          8 replies 25 retweets 265 likes
          Show this thread
        10. zeynep tufekci‏Verified account @zeynep 4 Aug 2020

          Write an article about aerosols, get a LinkedIn inbox that feels like who's who of HVAC/IAQ companies.😀 No I can't endorse products.😀😀 But my own AC is on the fritz? (And my landlord is trying to evict me, so not going corrupt and helping fix his AC for free at the same time!)

          3 replies 6 retweets 97 likes
          Show this thread
        11. zeynep tufekci‏Verified account @zeynep 4 Aug 2020

          YES! Dr. Fauci acknowledges some aerosolization. Says indoor/outdoor different, indoors "much greater risk than outside.” Emphasizes "mask-wearing indoors." Acknowledges ~5-10 μm can float, says they likely got that wrong.😀Now, hopefully new guidelines! https://www.cnbc.com/2020/08/03/fauci-says-theres-a-degree-the-coronavirus-is-spreading-through-air-particles.html …pic.twitter.com/flPn9T4V8a

          6 replies 82 retweets 266 likes
          Show this thread
        12. zeynep tufekci‏Verified account @zeynep 5 Aug 2020

          zeynep tufekci Retweeted MaximusDerrick

          💪🪟 Thrilled to see the message about the importance of ventilation *finally* breaking through to the broader public (at least, I hope so!). (Sane policies for/media coverage of the safer activities outdoors, maybe, too, one can hope?)https://twitter.com/misguidedsoul7/status/1291069337600774144 …

          zeynep tufekci added,

          MaximusDerrick @misguidedsoul7
          Fauci on @cnn saying same. "Open the windows.." he says https://twitter.com/zeynep/status/1290664160959889410 …
          7 replies 42 retweets 196 likes
          Show this thread
        13. zeynep tufekci‏Verified account @zeynep 8 Aug 2020

          zeynep tufekci Retweeted Prof. Jose-Luis Jimenez

          Why important to understand the role aerosols may play correctly even though they, too, cluster in close-range of the person. Droplets=only in front of one. Aerosols=escape behind one if mask is poorly fitting. Keep your mask on indoors even at distance.https://twitter.com/jljcolorado/status/1280935408398766080 …

          zeynep tufekci added,

          Prof. Jose-Luis JimenezVerified account @jljcolorado
          Masks: very useful visualization from Philo Bluyssen of TU Delft, one of the scientists in our group: - Pay attention to the fit of your mask - Don't stand behind soemone with a poorly fitting mask https://www.youtube.com/watch?v=mJ81IBTMvcU … https://www.tudelft.nl/bk/over-faculteit/hoogleraren/profdrir-pm-bluyssen/ …
          4 replies 62 retweets 153 likes
          Show this thread
        14. zeynep tufekci‏Verified account @zeynep 8 Aug 2020

          zeynep tufekci Retweeted Adriana Porter Felt

          Short answer: Hepa filters with no gimmicks (ionizer, UV) are good for unventilated spaces. Higher CADR (smoke rating) is better. If you can open windows/doors for good air circulation, better. Better answer: follow @jljcolorado @ShellyMBoulder @kprather88https://twitter.com/__apf__/status/1292085934767316997 …

          zeynep tufekci added,

          Adriana Porter FeltVerified account @__apf__
          Replying to @zeynep
          I wish there were guidance on whether high quality HEPA air purifiers that change the air several times an hour are useful indoors, and when or whether that's better than opening windows. (In winter, are we going to need to freeze, or will air purifiers substitute?)
          5 replies 40 retweets 159 likes
          Show this thread
        15. zeynep tufekci‏Verified account @zeynep 8 Aug 2020

          zeynep tufekci Retweeted Prof. Jose-Luis Jimenez

          Thread below with some answers. Also more experts to follow: @linseymarr, @corsiaq, @JimRosenthal4, @stephensbrent. That said, it's past time for CDC to step up and give us guidance on ventilation. As I wrote, Japan has been doing that since the beginning.https://twitter.com/jljcolorado/status/1291760621822726145 …

          zeynep tufekci added,

          Prof. Jose-Luis JimenezVerified account @jljcolorado
          7/ Selecting HEPA cleaner, DO NOT want ones that also have UV, ions or other bells-and-whistles. More $, don’t help, can be dangerous (see below). Filter already capturing the virus, which will decay there. Just change filter carefully, put in sealed bag, wash hands
          Show this thread
          3 replies 24 retweets 101 likes
          Show this thread
        16. zeynep tufekci‏Verified account @zeynep 8 Aug 2020

          zeynep tufekci Retweeted zeynep tufekci

          The dearth of communication from health authorities on even the most basic questions like the one below is maddening. The few experts on social media are doing what they can, but it's really time for the academy to form it's own shadow CDC to communicate.https://twitter.com/zeynep/status/1291777886014365696 …

          zeynep tufekci added,

          zeynep tufekciVerified account @zeynep
          Replying to @brianschatz
          Fourth option: it's more that person's problem than people around them. The virus seems to mostly spread *out* in drops of various sizes through the mouth, but is inhaled *in* and attaches well to the ACE2 receptors in the nose. Mouth-only mask is less protection for the wearer.
          4 replies 38 retweets 143 likes
          Show this thread
        17. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          Same dynamics that led to misrepresentation of mask research early on—ignoring evidence (a-presymptomatic spread), making baseless claims (false sense of security/harm), treating the public like children, lack of clarity on evidence to action etc. are in-play with ventilation.🙄

          3 replies 29 retweets 113 likes
          Show this thread
        18. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          "More research is needed." Yep, as usual. Just like with masks in March, there's a preponderance of evidence to act on ventilation. The answer to shortages was to treat the public as a partner & adults who deserve information; the answer to "don't scare the public" is.. the same.

          3 replies 32 retweets 135 likes
          Show this thread
        19. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          zeynep tufekci Retweeted Brian Resnick

          FWIW, the reason I got into ventilation/short-range aerosol research was what I heard from *epidemiologists* first who decisively argued that that epi data was the strongest reason to suspect this mode of transmission. This isn't a US-only conversation!https://twitter.com/B_resnick/status/1293934375009165312 …

          zeynep tufekci added,

          Brian ResnickVerified account @B_resnick
          Epis ask: "what are the patterns of contagion we're actually observing, and which known model do they fit?" Engineers ask: "what are the physics/mechanics of disease spread, and can we observe it, experimentally?"
          Show this thread
          2 replies 27 retweets 98 likes
          Show this thread
        20. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          That engineers are arguing for aerosol transmission while Epi/ID folks are against works only if one cherry-picks examples plus ignores countries with top-notch experts and solid track record outside the US/EU. Even here, despite disagreements, the consensus/overlap isn't small.

          2 replies 7 retweets 62 likes
          Show this thread
        21. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          This week, the WHO is holding a "wear-a-mask" challenge and our outlets are writing a "how did the WHO/US/CDC/UK/EU/media got it so wrong" articles. How about we do better this time and practice evidence-based causal inference and communication that treats the public like adults?

          1 reply 20 retweets 93 likes
          Show this thread
        22. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          Honestly, the idea that there's some sort of engineers vs. epidemiologists/infectious-disease specialists divide on airborne/aerosol transmission is just not true the moment you step out into the world. Japan, Hong Kong, South Korea, Taiwan.. US is just behind, again, that's all.

          3 replies 38 retweets 162 likes
          Show this thread
        23. zeynep tufekci‏Verified account @zeynep 13 Aug 2020

          zeynep tufekci Retweeted Trisha Greenhalgh

          This is why this "debate" matters. This isn't safe even if people are distanced (WHO says 3 feet and CDC says 6 feet is enough!!) exactly because short-range aerosols and their accumulation indoors, not just droplets that immediately fall, is a concern.https://twitter.com/trishgreenhalgh/status/1293826751844450304?s=20 …

          zeynep tufekci added,

          Trisha GreenhalghVerified account @trishgreenhalgh
          California’s problem: evangelical mega-churches with (they assume) God on their side. >6000 people, maskless, at an indoor service. https://www.cnn.com/2020/08/12/us/pastor-macarthur-church-california/index.html …
          3 replies 36 retweets 129 likes
          Show this thread
        24. zeynep tufekci‏Verified account @zeynep 15 Aug 2020

          Why getting airborne right matters. UNC has clusters. (Surprise? No). They're contact tracing for within six feet without masks. NOT ENOUGH FOR INDOORS. Distance isn't that protective indoors *and* source-control masks aren't magic. We need updated evidence-based guidelines ASAP.pic.twitter.com/ob2zTSVALa

          4 replies 87 retweets 220 likes
          Show this thread
        25. zeynep tufekci‏Verified account @zeynep 16 Aug 2020

          zeynep tufekci Retweeted

          The cost of not explaining the mode of transmission and risks correctly. This is simply not protective enough indoors, and CDC and the WHO need to urgently update their guidelines. (Look at that window that's being ignored!) https://twitter.com/ProfChrisMJones/status/1293909582692007936 …

          zeynep tufekci added,

          This Tweet is unavailable.
          3 replies 73 retweets 173 likes
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        26. zeynep tufekci‏Verified account @zeynep 16 Aug 2020

          (Also, the answer to the terminology issues is to use the terms people will use—yes, airborne—with ample description and visuals. Linguistics teaches us that we cannot prescriptively do away with people's words, and if we try, what we will get is misunderstanding misinformation.)

          2 replies 16 retweets 85 likes
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        27. zeynep tufekci‏Verified account @zeynep 16 Aug 2020

          zeynep tufekci Retweeted

          Other countries have managed to communicate this well, we can too. Japanese epidemiologists told me they suspected aerosols early on because of transmission data and acted accordingly—and have had a stellar public communication strategy. We should repeat. https://twitter.com/dylanhmorris/status/1294829604167876613 …

          zeynep tufekci added,

          This Tweet is unavailable.
          1 reply 70 retweets 161 likes
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        28. zeynep tufekci‏Verified account @zeynep 16 Aug 2020

          Remember the "people will not be able to wear masks correctly" or "they will have false sense of security" claims as obstacles to recommending masks even though other countries managed just fine? Let's not do this again. We can communicate with the public, just like others do.

          5 replies 40 retweets 218 likes
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        29. zeynep tufekci‏Verified account @zeynep 16 Aug 2020

          zeynep tufekci Retweeted Julia Marcus, PhD, MPH

          Alternative to communicating the correct & detailed mental models to the public is rigid, rule-based but ineffective behavior. The problem isn't just terms—which cannot be dictated if there is an everyday word: it's insufficient effort in explaining them.https://twitter.com/JuliaLMarcus/status/1294784174616961025 …

          zeynep tufekci added,

          Julia Marcus, PhD, MPHVerified account @JuliaLMarcus
          Replying to @zeynep
          And 15 minutes isn't a magic number! I just talked to some college basketball coaches who were told students could only practice together for 14 minutes at a time.
          2 replies 25 retweets 108 likes
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        30. zeynep tufekci‏Verified account @zeynep 17 Aug 2020

          zeynep tufekci Retweeted Adam Hamdy

          Stellar example of effective science communication from @JamesEKHildreth who clearly but matter-of-factly explains a latest key paper on aerosol transmission, and why, by itself, distance isn't all protective indoors—especially in low ventilation settings.https://twitter.com/i/status/1294947678011502592 …

          zeynep tufekci added,

          2:06
          Adam Hamdy @adamhamdy
          1. Dr. James Hildreth, CEO of Meharry Hospital and adviser to Nashville Mayor John Cooper, makes a powerful statement about schools and airborne transmission. A MUST WATCH example of excellent public health communication about #COVID19 Part 1 of 3 pic.twitter.com/D4C6DpCchy
          Show this thread
          3 replies 91 retweets 147 likes
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        31. zeynep tufekci‏Verified account @zeynep 17 Aug 2020

          zeynep tufekci Retweeted Dustin Poppendieck

          Excellent FAQ for use of HEPA filters in indoor environments. Keep in mind: mitigations stack and every layer helps reduce risk. Masks. Distance. Effective filters (HEPA). Ventilation. Reduce crowding. Less talking. Keep within a cohort. etc. All adds up.https://twitter.com/Poppendieck/status/1292433631743561729 …

          zeynep tufekci added,

          Dustin Poppendieck @Poppendieck
          My FAQ on COVID19 in classrooms: http://poppendieck.com/IAQ/COVID19%20FAQ.html … Including: -Do portable HEPA air cleaners remove the virus from the air? -Won't a portable air filter just move the air with contaminated aerosols around to infect more people? -Where should I put it in the classroom?
          2 replies 65 retweets 151 likes
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        32. Show replies

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