Articles | Volume 17, issue 7
Atmos. Chem. Phys., 17, 4711–4730, 2017
https://doi.org/10.5194/acp-17-4711-2017
Atmos. Chem. Phys., 17, 4711–4730, 2017
https://doi.org/10.5194/acp-17-4711-2017

Research article 11 Apr 2017

Research article | 11 Apr 2017

Long-term air concentrations, wet deposition, and scavenging ratios of inorganic ions, HNO3, and SO2 and assessment of aerosol and precipitation acidity at Canadian rural locations

Irene Cheng and Leiming Zhang

Data sets

Canadian National Atmospheric Chemistry (NAtChem) Particulate Matter and Precipitation Chemistry Database Environment and Climate Change Canada (ECCC) https://www.ec.gc.ca/natchem/default.asp?lang=En&n=6562770F-1

National Pollutant Release Inventory (NPRI), Air pollutant emission inventory Environment and Climate Change Canada (ECCC) http://www.ec.gc.ca/inrp-npri/donnees-data/ap/index.cfm?lang=En

National Emissions Inventory USEPA https://www.epa.gov/air-emissions-inventories

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Short summary
Geographical and long-term (1983–2011) trends in air concentrations and wet deposition of inorganic ions and aerosol and precipitation acidity were analyzed at 31 sites in Canada. Declines in atmospheric ammonium, nitrate, and sulfate were consistent with decreasing emissions of NH3, NOx, and SO2. A decline in nitrate and sulfate wet deposition was also observed. Wet scavenging was further studied by estimating scavenging ratios and relative contributions of gases and aerosols to wet deposition.
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