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Passive ventilation is like sunlight from windows. Classroom clearly has lights to supplement sunlight when windows are open to sufficiently illuminate for reading. Similarly, classroom also needs air purifiers to meet state and federally recognized 5 air changes per hour.

Western US looks relatively peaceful at the moment wrt particles fire.airnow.gov vs map.purpleair.com

CHALLENGE: What are the least cost, most effective, and operationally best air purifiers to get 5 air changes per hour in a typical classroom with following characteristics? * 6,600-12,000 cubic feet * no HVAC * closed windows Please explain why.

Devabhaktuni "Sri" Srikrishna Sam Kaufman Toronto District School Board Oh wait …

Devabhaktuni "Sri" Srikrishna Also consider standalone room ventilation systems. There's many examples for classrooms that meet bb93 acoustic requirements. This one, for example, delivers up to 260l/s or 936m3/h. I haven't read all the specs, but it recently won a prize cibsejournal.com/technical/targ…

AI that manages you but limited by its context window?

VOC

Depending heavily on vaccines for #H5N1 epidemic mitigation is risky. In our e-letter in Science Magazine we outline reasons why Ranu Dhillon Devabhaktuni "Sri" Srikrishna science.org/doi/10.1126/sc…

CDC wastewater shows flatline for Covid but SF public health data shows uptick in diagnostic test positivity at 4.9% (last 7 days), latest data exceeding 5%. For comparison, nationally CDC shows 3% test positivity but no upward trend unlike SF. Is there a storm brewing? 🌧️

Covid rising again in SF with 6% test positivity (after a long lull) sf.gov/data--covid-19…

SF: Huge SARS wastewater spike last sampled June 29. COVID Positivity highest since August 19.

Just got through TSA (+ precheck) without having to remove my respirator!!! JFK airport also has a rooftop w/ tables to eat at btw.

It remains unclear if #H5N1 bird flu will ever cause a pandemic If it does, vaccines may not be enough to stop it In a Science Magazine eLetter, Abraar Karan Devabhaktuni "Sri" Srikrishna Robert Garry & I explain why science.org/doi/10.1126/sc…

Wildfire smoke travels hundreds of miles. The region gets blanketed. Again. And again. And again.

Just. Wow. As we went over Mexico and the U.S. this morning, I caught this sprite. Sprites are TLEs or Transient Luminous Events, that happen above the clouds and are triggered by intense electrical activity in the thunderstorms below. We have a great view above the clouds, so

Test positivity (human diagnostic) is not low in SF at around 7% even if it is low nationally.

LA too