> >For the aerosol discussion this is out of the CDC. Preliminary results but noteworthy

"our findings suggest retained infectivity and virion integrity for up to 16 hours in respirable-sized aerosols."

Thanks for pointing this out.

<speculation> Their finding above could explain the rapid spread of infection in specific settings. Potentially related, someone pointed out to me today that the areas with recent increases in spread are areas where people are likely to stay inside for air conditioning purposes this time of year. And those areas are potentially recirculating indoor air more than in the spring.</speculation>

Thinking out loud: I wonder if anyone has thought about what measurements might be appropriate to make to assess whether the occupancy loads for labs or classrooms are appropriate after groups have started to gather in them. For example, OSHA's 1000 ppm target for CO2 includes a safety element to reduce transmissions of colds, etc. That's something that is relatively easy to monitor over time.

- Ralph

Ralph Stuart, CIH, CCHO
Environmental Safety Manager
Keene State College
603 358-2859

ralph.stuart**At_Symbol_Here**keene.edu

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