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Wildfire smoke impacts on indoor air quality assessed using crowdsourced data in California
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Wildfire smoke impacts on indoor air quality assessed using crowdsourced data in California
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Journal Article
Wildfire smoke impacts on indoor air quality assessed using crowdsourced data in California
2021
Overview
Wildfires have become an important source of particulate matter (PM2.5 < 2.5-μm diameter), leading to unhealthy air quality index occurrences in the western United States. Since people mainly shelter indoors during wildfire smoke events, the infiltration of wildfire PM2.5 into indoor environments is a key determinant of human exposure and is potentially controllable with appropriate awareness, infrastructure investment, and public education. Using time-resolved observations outside and inside more than 1,400 buildings from the crowdsourced PurpleAir sensor network in California, we found that the geometric mean infiltration ratios (indoor PM2.5 of outdoor origin/outdoor PM2.5) were reduced from 0.4 during non-fire days to 0.2 during wildfire days. Even with reduced infiltration, the mean indoor concentration of PM2.5 nearly tripled during wildfire events, with a lower infiltration in newer buildings and those utilizing air conditioning or filtration.
Publisher
National Academy of Sciences
