A new study by air quality scientists tested four models of low-cost air quality monitors during actual wildfire pollution events and found that their readings of PM2.5 - or particulate matter under 2.5 microns, which has been linked to respiratory and cardiovascular issues - were consistently higher than the reference monitor used by the regulatory agencies; however, since each monitor had a relatively consistent response to the smoke, it is possible to use the readings to estimate true PM2.5 levels.
from Health & Medicine News -- ScienceDaily https://www.sciencedaily.com/releases/2020/08/200818094009.htm
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