Spatial Variability of Sources and Mixing State of Atmospheric Particles in a Metropolitan Area

Environmental Science & Technology
Qing YeNeil M Donahue

Abstract

Characterizing intracity variations of atmospheric particulate matter has mostly relied on fixed-site monitoring and quantifying variability in terms of different bulk aerosol species. In this study, we performed ground-based mobile measurements using a single-particle mass spectrometer to study spatial patterns of source-specific particles and the evolution of particle mixing state in 21 areas in the metropolitan area of Pittsburgh, PA. We selected sampling areas based on traffic density and restaurant density with each area ranging from 0.2 to 2 km2. Organics dominate particle composition in all of the areas we sampled while the sources of organics differ. The contribution of particles from traffic and restaurant cooking varies greatly on the neighborhood scale. We also investigate how primary and aged components in particles mix across the urban scale. Lastly we quantify and map the particle mixing state for all areas we sampled and discuss the overall pattern of mixing state evolution and its implications. We find that in the upwind and downwind of the urban areas, particles are more internally mixed while in the city center, particle mixing state shows large spatial heterogeneity that is mostly driven by emissions. This st...Continue Reading

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Citations

May 15, 2019·International Journal of Environmental Research and Public Health·Peishi GuAlbert A Presto
May 22, 2020·The Science of the Total Environment·Hugh Z LiNatalie J Pekney
Nov 27, 2018·The Science of the Total Environment·Provat K SahaAlbert A Presto
Oct 30, 2020·The Science of the Total Environment·Hugh Z LiNatalie J Pekney
Apr 17, 2021·Proceedings of the National Academy of Sciences of the United States of America·Yuanzhou HuangAllan K Bertram

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