Clean Air For Class @CA4Class
A campaign group urging the Scot Gov to place CO2 monitors and HEPA air purifiers in every classroom and count classmates as close contacts. Sign the petition! chng.it/mXc4sLHqNt Scotland Joined September 2021-
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@CathNoakes @trishgreenhalgh @kprather88 @JimRosenthal4 @CleanAirCrewOrg @TravellingTabby @TigressEllie
We’ve been quiet for too long. It’s vital now more than ever that classrooms have HEPA purifiers and Co2 monitors in every room. Protecting education is paramount so let’s make it safer. We shouldn’t have to choose between education and health.
19/ Or search many more resources (using 'Cntrl-F') for "CO2" on the (1) Reports, Guides, Tools; (2) Media; or (5) Threads tabs here: bit.ly/3fzmB16
18/ Lots of other 🧵s to learn more about CO2 & ventilation, e.g. here by @CathNoakes, @Poppendieck, @CorsIAQ: x.com/CathNoakes/sta… x.com/CathNoakes/sta… x.com/CathNoakes/sta… x.com/Poppendieck/st… x.com/Poppendieck/st… x.com/HuffmanLabDU/s…
@Sisu56693590 Lots of resources to read up on CO2 sensing. Short video overview: news.yahoo.com/co-2-monitors-… Article: washingtonpost.com/health/2021/02… Simulations: english.elpais.com/usa/2021-03-29… Re-breathed fraction: x.com/CorsIAQ/status… Handy graphic: x.com/RichardBarrow/…
17/ This is a good one-slide summary of #RebreathedFraction using CO2 as a tracer, by @Poppendieck: x.com/Poppendieck/st…
16/One way to think about indoor CO2 concentrations is to consider the "rebreathed fraction". For every ~400 ppm above the baseline (usually also ~400 ppm), 1% of your air is '#rebreathed' from someone else's exhaled air. E.g. via @CorsIAQ: x.com/CorsIAQ/status…
2/ RF can be calculated as RF = (CO2in - CO2out)/CO2breath Here CO2in is CO2 concentration in the indoor space, CO2out is the outdoor CO2 concentration, and CO2breath is the typical CO2 concentration on human breath (around 36,000 to 38,000 ppm) w/ some variation by diet, etc.
15/ This is a summary of a somewhat more technical perspective on using CO2 as a proxy for airborne viral aerosol risk indoors, with great additional info gathered by @jljcolorado: x.com/jljcolorado/st…
1/ CO2 and COVID transmission Our paper (former preprint) is now published after peer-review in Environ. Sci. Tech. Letters: pubs.acs.org/doi/10.1021/ac…
14/ There are lots of tools available to understand how CO2 sensing can be leveraged best. E.g. see this tool by @HarvardChanSPH & @j_g_allen (reminded today via @linseymarr) x.com/j_g_allen/stat…
SCHOOLS. Are you using CO2 monitors to assess ventilation? If so, that's great! Now - have you set a *target* CO2 level? If not, we built a simple tool for you: 1. Pick your target ACH 2. Enter room info 3. Enter people info schools.forhealth.org/covid-19-tools/ docs.google.com/spreadsheets/d…
13/ I've gotten a lot of question about what CO2 sensor to buy. I use the #Aranet4 sensor extensively, but at ~$200+, it's not cheap. [Aranet coupon: naltic.com/aranet4coupon.…] Whatever you buy, make sure the sensor is NDIR (non-dispersive infrared). docs.google.com/document/d/1K6…
12/ Several sites allow people to share their CO2 data for the public to see. For example, see the site put together by @ariccio or the work that @SchoolAQFund is now beginning. x.com/ariccio/status…
@mdc_martinus ...and people can share them now 😉 covid-co2-tracker.herokuapp.com/home
11/ But #CO2 monitors are not just for school. I've loaned mine out to friends who have had fun seeing the invisible trends in various places they go. Here is one set of anecdotes on how I played around with CO2 sensors in school, at work, and at home: x.com/HuffmanLabDU/s…
1/ A 🧵 on some #CO2 measurements in my home, car, school *AND* details/instruction on how to use dry ice for DIY estimate of #ventilation rates at your home or as a school project. Highlights in thread & gathered together in the linked doc 👇. #COVIDCO2 docs.google.com/presentation/d…
10/ Once you've collected your data, make sure to share using the hashtag #COVIDCO2 and peruse for further ideas & support (Thx @mdc_martinus!). Some have also used #SchoolCO2. x.com/mdc_martinus/s…
1/ A 🧵 on some #CO2 measurements in my home, car, school *AND* details/instruction on how to use dry ice for DIY estimate of #ventilation rates at your home or as a school project. Highlights in thread & gathered together in the linked doc 👇. #COVIDCO2 docs.google.com/presentation/d…
9/ There are lots of creative ways that people have been using as they send CO2 monitors: x.com/HuffmanLabDU/s…
Sending a #CO2 monitor with a kid to school is one way to get a rough idea of the ventilation quality. Curious to hear your simple or sneaky strategies of how you've sent a #COVIDCO2 monitor. (DIY innovations aren't just for people making a #CorsiRosenthalBox for filtration. 😉)
8/ I've been encouraging parents who want to send a CO2 sensor with a child to make sure they don't push a child past their comfort zone. Make sure the sensor won't be a distraction during the day. And it's important that the parent, not the student, bear the responsibility.
7/ As @EmilyAnthes points out in the NY Times article above, many parents have seen backlash against sending CO2 monitors. Some of those brief parent stories are here: x.com/kprather88/sta… x.com/HuffmanLabDU/s…
An opportunity for an important, interesting story for some national & local journalists. It won't be hard to ask around Twitter for parents who have been blocked from sending CO2 monitors after their kids recorded unhealthy CO2 (meaning poor ventilation) 👇. #COVIDCO2 #SchoolCO2
6/ Gathering CO2 data is often discouraged, however: “It’s possible that the school district may not be all that happy with this because I think it gives us a window into the fact that they may not actually be treating ventilation as seriously as they should be,” Dr. Huffman said
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