Discover and read the best of Twitter Threads about #HBA2021
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#HBA2021 Claire Barnett:
Children are not little adults.
Schools are not just little offices.
Schools are the second largest public building expenditure after roads.
Children are not little adults.
Schools are not just little offices.
Schools are the second largest public building expenditure after roads.
Schools contain mainly women and children (>90%).
Schools were not COVID19 ready. CDC did not prioritize IAQ until May 2021. "Our schools are not designed to do that."
8 billion ft2 of schools >$3 Trillion in schools are not climate ready.
Schools were not COVID19 ready. CDC did not prioritize IAQ until May 2021. "Our schools are not designed to do that."
8 billion ft2 of schools >$3 Trillion in schools are not climate ready.
>12,000 schools are within 1 mile of a chemical hazard.
Heat waves: children do not test well or learn at high heat. Perhaps lower thresholds to send kids home?
Should schools operate during forest fires? Schools aren't designed to handle extreme particle levels.
Heat waves: children do not test well or learn at high heat. Perhaps lower thresholds to send kids home?
Should schools operate during forest fires? Schools aren't designed to handle extreme particle levels.
#HBA2021: Greg Whitely. What is the definition of clean? We clean materials to visual inspection to clean microbes we can't see.
We shed 40 million skin cells per day. We touch our faces 20-40 times a minute.
We shed 40 million skin cells per day. We touch our faces 20-40 times a minute.
Superbugs in hospitals have not taken the last two years off.
Some microbes can survive in a viable form for years in biofilms.
Organisms you touch can remain on your fingers for up to 19 consecutive touches (and move to other surfaces).
Some microbes can survive in a viable form for years in biofilms.
Organisms you touch can remain on your fingers for up to 19 consecutive touches (and move to other surfaces).
The spread of microbes on surfaces is not uniform. If you use the wrong form of cleaning you can actually spread the microbes rather than remove them.
There are 9 variables in wiping a surface (pressure, disinfect to towel surface, frequency, etc.).
There are 9 variables in wiping a surface (pressure, disinfect to towel surface, frequency, etc.).
#HBA2021. @anna_s_young. Sampled 231 office workers with wrist silicon wrist bands (only worn at the office) in US, UK, India and China. Analyzed for SVOC in 100 wrist bands by Heather Stapleton's group.
Exposure to chemical classes varied by location.
Exposure to chemical classes varied by location.
US workers exposed to PCBs that were banned 40 years ago. Exposures to PCBs in India higher. Paint likely a PCB source.
Brominated flame retardant higher in US and UK compared it China and India. People still exposed to flame retardants that have been banned over 10 years.
#HBA2021 - Antonios Tasoglou. Investigated electronic air cleaners using real time instrumentation. Used 30 m3 chamber, 25C and 50%. Limonene, formaldehyde and toluene as challenge gases. 1/5
Analyzed with ozone, PTRMS, DNPH, Tenax, particle counts as analysis methods. Example electronic cleaner with UVC/TiO2/HEPA/carbon filter. Limonene and toluene decreased to zero within an hour, formaldehyde did not decrease below 40 ppb after four hours. 2/5
Loss rates for limonene and toluene were 4-5/h. For formaldehyde the loss rate was only 0.7/h, as it is an oxidation product of toluene and limonene. 3/5
