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Indoor and Outdoor Particulate Matter Exposure of Rural Interior Alaska Residents

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Document pages: 24 pages

Abstract: Toassess the exposure of residents in rural communities in the Yukon Flats toparticulate matter of 2.5 μm or less in diameter (PM2.5), bothindoor and outdoor concentration observations were carried out from March toSeptember 2019 in Ft. Yukon, Alaska. Indoor concentrations were measured at0.61 m (breathing level during sleeping) in homes and at 1.52 m heights(breathing level of standing adult) in homes and office commercial buildings.Air quality was better at both heights in cabins than frame homes both duringtimes with and without surface-based inversions. In frame houses,concentrations were higher at 0.61 m than 1.52 m, while the opposite is truetypically for cabins. Differences between shoulder season and summer indoorconcentrations in residences were related to changes in heating, subsistencelifestyle and mosquito repellents. In summer, office and commercial buildings,air quality decreased due to increased indoor emissions related to increaseduse of equipment and mosquito pics as well as more merchandise. During summerindoor concentrations reached unhealthy for sensitive groups to hazardousconditions for extended times that even exceeded the high outdoorconcentrations. Due to nearby wildfires, July mean outdoor concentrations were55.3 μg·m-3 which exceeds the 24-h US National Ambient Air QualityStandard of 35 μg·m-3. Indoor and outdoor concentrations correlatedthe strongest with each other for office commercial buildings, followed byframe houses and cabins. Office commercial buildings with temperature monitorshad one to two orders of magnitude lower concentrations than those without.

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