The San Joaquin Valley (SJV) in California experiences persistent air quality problems associated with elevated particulate matter (PM) concentrations, especially in winter, due to anthropogenic emissions, topography, and meteorological conditions. Unravelling the various sources and processes that affect the PM is important to better inform pollution abatement strategies and improve air quality models. In this talk, results from ground and aircraft measurements made during the 2013 DISCOVER-AQ field study are discussed and used to develop insights into the factors that govern wintertime particulate pollution in the San Joaquin Valley (SJV) air basin, with a particular focus on particulate ammonium nitrate (AN).
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