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Jan 20 • 5 tweets • 3 min read
Measuring CO2 indoors and trying to figure out what’s a “good” level? Our Harvard #HealthyBuildings team built an easy tool to help you.

1. Input room size and # of people
2. Select target air changes
3. Hit “Calculate”

🧵
2/ Our CO2 calculator can be accessed here:

forhealth.org/tools/co2-calc…
3/ Not sure what the target ACH should be? Our Lancet @Commissioncovid Task Force released a report where we recommend 4-6 ACH

4=good
5=better
6+=best

covid19commission.org/safe-work-trav…
4/ 4-6 ACH rec is in-line with our paper in JAMA (w/ @AndrewMIbrahim

jamanetwork.com/journals/jama/…
5/ Reminder that CO2 only tells you about outdoor air ventilation, not filtration. Low CO2 you’re in good shape. High CO2 and it depends on filtration. Read the caveats on the website for our tool.

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More from @j_g_allen

Joseph Allen Profile picture
Jan 10
The silicone wristbands we use in this study act as passive air quality samplers, constantly absorbing chemicals in the air around us. Then we put those wristbands into hormone assays...

--> Every wristband extract was **hormonally active**
In our prior work, we did something similar, but with dust, and found that dust is **hormonally active**. This study shows that indoor air is, too. This shouldn't surprise anyone, based on what we know about the potential for chemicals in products to leach out into the indoor env
There are SOLUTIONS! Harvard is doing this, led by @H_Henriksen1 and @GreenHarvard. Demanding disclosure of what's in products we buy, and telling the market we don't want products w/ certain classes of chemicals. seas.harvard.edu/news/2021/03/s…
Read 4 tweets
Joseph Allen Profile picture
Dec 27, 2022
Good time to re-up something I wrote last year:

"We cannot continue to subject kids to the 2020 playbook as adults go out and do whatever they want. And, remember, parents who don’t feel comfortable can always have their children wear high-grade masks."
cbsnews.com/boston/news/bo…
Boston Public Schools made investments in ventilation/filtration (5,000 air cleaners), and is one of only a few districts in country actively monitoring CO2
So bizarre to me how one-way masking got attacked…
Read 5 tweets
Joseph Allen Profile picture
Dec 19, 2022
Very different for me. Abstract last. The "story" comes from the Results.

Here's my recommended approach, if anyone's curious.🧵
Step 1: INTRO

Write your Introduction *before* you launch your study. Why? You have to understand the landscape and gaps in the literature before you undertake the study, right? In my lab we often call this writing "Paper 0" of a thesis or dissertation.
Now, plop your "way too long" intro into the manuscript for a placeholder. (see, it's already building out nicely!) You can chop this down later.
Read 12 tweets
Joseph Allen Profile picture
Dec 16, 2022
IMPROVING INDOOR AIR QUALITY IN LONG-TERM CARE FACILITIES. PRACTICAL GUIDANCE.
---
Several attendees asked for the slides from the opening remarks today. I put them all in this thread.
---
🧵
Image
Image
Read 21 tweets
Joseph Allen Profile picture
Dec 14, 2022
Three of my friends @HarvardChanSPH got promoted to Assoc Prof this fall. The people I get to work with...just floored. Check out their bios and questions they're researching:

Dr. Zac Nagel
Dr. Kris Sarosiek (@CellDeathLab)
Dr. Tamarra James-Todd (@TJamesTodd_PhD)
🧵
Zac, answering big questions:

--> Why can some tolerate exposure to DNA damaging agents such as radiation, sunlight, ROS and tobacco smoke, while others develop disease?
--> Why do some cancers respond to radiation and chemotherapy, while others do not?
hsph.harvard.edu/zachary-nagel/
Kris, answering big questions:

--> What determines whether a cell will live or die in response to damage or stress?
--> Why are some individuals, in particular young children, more sensitive than others and how can we intervene to improve outcomes?
hsph.harvard.edu/kristopher-sar…
Read 4 tweets
Joseph Allen Profile picture
Dec 11, 2022
If you read this, you'll see that it matches the recs in our Lancet @CommissionCovid report on "The #FirstFour Strategies Every Building Should Pursue".
🧵
Lancet: Commission building systems (give them a tune-up)

WH: "verify proper ventilation in federally owned buildings"
Lancet: improve ventilation

WH: "Providing tools and guidance documents for improving ventilation"
Read 9 tweets

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