ICYMI, @By_CJewett did an excellent job last week on #ScienceFriday w/ @iraflatow. Worth a 14-min listen on key points about air cleaners for school & elsewhere.

Here are some additional thoughts & links on in-room air cleaners as a 🧵 (1/x)
2/ I think this bit from @By_CJewett takes it home:
"Your HEPA filter is kind of like a pair of kaki pants or a garden hose. It's not on-patent, it's not expensive, it's not that hard to find, and there's not a salesforce for it."
3/ "But what you do see is the more electronic air cleaners. Those are the companies going to the school boards, talking about ionization ... they sound spectacular"
4/ (via @By_CJewett & also @LaurenWeberHP)
"... people can make $600+ per device on some of these electronic air cleaners."
"This sounds amazing. The school board just wants to tell the parents everything is safe & things just sort of snowball from there."
5/ An associated thread by @By_CJewett on the radio show, with other great links to follow.
Summary of IAQ advice -- stick to HEPA filtration for in-room use and avoid ionization and other unproven technologies.
7/ @msjpauly has also written several great articles on avoiding ionizers technology for air cleaners, e.g. here via @MotherJones:
8/ Unfortunately, a LOT of schools in the US & worldwide have bought into the hype of ionization and other unproven air cleaning technology:
9/ But indoor air quality experts are consistent in their strong recommendations to focus on proven technologies like HEPA filtration, ventilation, and/or upper-room germicidal UV when necessary.
E.g. letter here by @marwa_zaatari & @MarcelHarmon1:
11/ There is also plenty of reason to avoid chemical-based air cleaning technologies. For example, see this nice thread by @CorsIAQ on the dangers of ozone (O3) use indoors:
12/ The near-unanimous recommendation from #IAQ scientists is to apply proven technologies like HEPA filtration.

See, e.g. recommendations in this Lancet report on infectious disease resilience for school buildings. But benefits go well beyond pandemics:
13/ Or see similar recommendations by the @JohnsHopkinsSPH team, incl. @polsiewski. Same story: avoid unproven technologies, rely on ventilation and HEPA filtration indoors.
14/ The studies supporting the use of proven technologies, especially in-room HEPA filtration, are seemingly endless. One important one is the Lindsley et al. study via @CDCMMWR from earlier this year:
15/ There are questions people often ask on what filtration-based air cleaner to buy. @marwa_zaatari has put out some nice analyses, like those shown below. She is a great person to follow for these.
16/ DIY air cleaners like the #CorsiRosenthalBox or single-filter #BoxFaFilter units can be good choices to save some money. See e.g. this great summary resource by @CleanAirCrewOrg:
17/ There has been a lot written recently about school districts making poor choices on air cleaners for classrooms, e.g.:
18/ Again, upper-room germicidal UV is another strategy for in-room disinfection.


@ShellyMBoulder is an expert to follow here:
19/ Much has been written on the importance of improved indoor air quality, including the needed focus on proven methods like ventilation with outdoor air & HEPA filtration. E.g. see old OpEd by @ChemDelphine, @marinavance, and me:
20/ And in the current context of Delta-COVID concerns, it's not just masks and ventilation that are important, but another opportunity to deploy HEPA filtration for immediate improvements in indoor air quality:
21/ I wanted to share some of these stories. But follow experts like these wrt topics of indoor air cleaning, e.g.
@ChemDelphine @ShellyMBoulder @CorsIAQ @stephensbrent @EarthMechanic @WaringIAQ @gcmorr @marwa_zaatari @marinavance @WBahnfleth @Poppendieck @CathNoakes @j_g_allen

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More from @HuffmanLabDU

16 Sep
🔥 by @DrAliceVirgil1 in @PsychToday. She argues indoor school meals are not only dangerous during COVID, but further destabilize a sense of truth and reality among gaslit students.

Short 🧵 from article + links on lunchtime risk
(ht @kprather88)
2/ "The term gaslighting comes from the 1944 film Gaslight ... invalidating her reality and understanding of her experiences."

"Trust in the person or entity doing the gaslighting is essential for it to be an effective tool to undermine a person’s entire perception of reality." https://en.wikipedia.org/wi...
3/ "Yet, every day in countless lunchrooms across America, as both the New York and Chicago school districts have noted, children are eating and talking loudly, unmasked, in crowded indoor spaces without proper ventilation."
Read 9 tweets
16 Sep
Article w/ tips on childrens' masks, by @BetsyMorris2. (🧵 & info, 1/x)

My quotes didn’t make article cut, but I agree w/ many others who have said priority order is:
1) Wearability (quality irrelevant if kid won’t wear)
2) Tight fit
3) Filtration quality
2/ In the context of kid masks, it’s worth following @masknerd and looking through great contributions he has made to provide test data & evaluations of various adult and kid masks:

3/ The article also mentions an open Google doc put together by @ajprussin & @linseymarr on various kid masks, which is a useful resource:
Read 7 tweets
11 Sep
Important #CDC update yesterday improves guidance on mask quality & fit; now recommends #N95 respirators as one option for #BetterMasks. (1/x)

Updates like this don't just happen. People like @kprather88 & @linseymarr have been pushing behind scenes. 🙏
2/ Also important: N95s are not limited due to a supply chain shortage. True for months and why the CDC finally updated their guidance yesterday.
@projectn95 is a non-profit that provides a marketplace for vetted masks at low price:
3/ Any mask is better than no mask, but given the highly contagious Delta variant that now dominates, you should wear the best mask you can. See this great interview clip with @mtosterholm motivating the use of upgraded masks:

Read 14 tweets
9 Sep
So glad to see growing national push to #EatOutside & increase #school lunch safety. Anytime masks come off indoors, COVID risk increases.

@HeidiNBC 👇: "Does this cost money?"
Principal: “Money?! No, we just used our brains!”

Full 🧵 of links & info. #DrFauci up next ... (1/x)
2/ Parents here realized that if adults need to be very careful w/ indoor dining when masks are off, so do school kids during lunch.
@HeidiNBC: "Here's what they do. It's not hard. They open these doors, the kids come out."

h/t @SmartRestartAPS
3/ #DrFauci today" "You have pretty good prevention measures at the time you’re in the class or working, and then you let your guard down when you get a lunchbreak and you take your mask off, b/c you have to take your mask off to eat."
Read 20 tweets
6 Sep
A great episode of #NOVANow by @AlokPatelMD on back-to-school concerns (Sept. 2).

First 18 min. @linseymarr does an excellent summary of the basics of airborne spread & most important areas for #schools to focus.

"My biggest concern is lunchtime." (1/x)
2/ (14:40) "My biggest concern is lunchtime. Eating in a cafeteria is my pandemic nightmare scenario. In order to eat you have to remove your mask. There are hundreds of kids in there together. They're seated closely together at these long tables. Everyone's trying to talk ..."
3/ "... and be heard. That's kind of the worst possible situation. Crowding. Close together. Loud talking. You release aerosols and droplets when you talk, and the louder you talk the more you release. ..."
Read 6 tweets
27 Aug
Report on a #Delta outbreak in elementary #school

80% of kids in front 2 rows infected!

- Can we pls take school precautions seriously?
- Kids <12 yrs unvaxxed & vulnerable
- Don't take off your mask (to read aloud)!
- Wear a (good) mask **correctly** 👇
2/ This MMWR report ⬆️ seems scary & catches attention. Good. We need to pay attention.

- Delta is very contagious & kids get sick
- Vax is critical for everyone possible
- But vax isn't silver bullet alone. Even vaxxed can transmit
The good news next ...
3/ #Schools can help w/ layers:
- Good, tight masks reduce room risk & at inhale
- Also distance, good ventilation, room filtration, outside meals

Risky w/ unvaxxed kids in schools at all -- but no question if schools & teachers don't take this seriously
Read 6 tweets

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