Wildfire smoke impacts on indoor air quality assessed using crowdsourced data in California

Wildfires have become an important source of particulate matter (PM < 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 PM into indoor environments is a...

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Vydáno v:Proceedings of the National Academy of Sciences - PNAS Ročník 118; číslo 36
Hlavní autoři: Liang, Yutong, Sengupta, Deep, Campmier, Mark J, Lunderberg, David M, Apte, Joshua S, Goldstein, Allen H
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 07.09.2021
Témata:
Air Pollution, Indoor
California
Crowdsourcing
Environmental Exposure
Environmental Monitoring - methods
Fires
Humans
Particulate Matter - analysis
Smoke
California
biomass burning
low-cost PM2.5 sensors
exposure
indoor air
PM2.5
ISSN:1091-6490, 1091-6490
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Shrnutí:Wildfires have become an important source of particulate matter (PM < 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 PM 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 PM of outdoor origin/outdoor PM ) were reduced from 0.4 during non-fire days to 0.2 during wildfire days. Even with reduced infiltration, the mean indoor concentration of PM nearly tripled during wildfire events, with a lower infiltration in newer buildings and those utilizing air conditioning or filtration.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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content type line 23
ISSN:1091-6490
1091-6490
DOI:10.1073/pnas.2106478118