Coupled Indoor-Outdoor Aerosol Mass, Composition, and Size Measurements from a Residential Home in Fairbanks, Alaska during ALPACA 2022
ELLIS ROBINSON, Andrew Holen, Judy Wu, Kerri Pratt, Karolina Cysneiros de Carvalho, Brent Williams, Damien Ketcherside, Vanessa Selimovic, Robert J. Yokelson, Lu Hu, Ting Fang, Kasey Edwards, Sukriti Kapur, Manabu Shiraiwa, Kayane Dingilian, Yuhan Yang, Michael Battaglia, Rodney J. Weber, Tianren Wu, Dusan Licina, Jingqiu Mao, William Simpson, Peter F. DeCarlo,
Johns Hopkins University Abstract Number: 463
Working Group: Biomass Combustion: Outdoor/Indoor Transport and Indoor Air Quality
AbstractHigh northern latitude urban areas represent an under-studied air quality context despite having strong emissions sources and meteorological conditions that regularly lead to bad air quality, and expected growth in population in the coming decades. Fairbanks, Alaska is a canonical example, where sources and meteorology interact to regularly create intense air pollution episodes. The Alaska Layered Pollution And Chemical Analysis (ALPACA) campaign was established to better understand the sources and meteorological conditions present in high-latitude cities during wintertime, using Fairbanks as a test-case. As part of ALPACA, a residential house was used as a field-site for coupled indoor-outdoor air pollution sampling, to better understand indoor exposures to outdoor air pollution, outdoor-indoor transformations, and source characterization of typical indoor PM sources (e.g., pellet stove, cooking, incense burning). Here our focus is high time-resolution aerosol mass, composition, and size measurements from a HR-ToF-AMS. We identify major outdoor PM sources using Positive Matrix Factorization source-apportionment, and illustrate how those sources are transformed upon transport indoors. We also report indoor air-quality (IAQ) metrics such as air exchange rates, indoor-outdoor (I/O) pollutant ratios, and indoor-outdoor transport timescales. Our results add to the literature on air pollution in cold and dark cities, as well as the IAQ literature.