Things I have learned…

Information about particle sizes has changed over the years and new information is shedding concern on the smaller particle sizes doing more damage than once thought. Small particles less than 1 micron (um) fall slowly and can take days to years to settle out of a quiet atmosphere; or may never settle out in a turbulent atmosphere. Small particles can include viruses, small bacteria, metallurgical fumes, soot, oil smoke, tobacco smoke, clay, and fumes.

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