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ACP | Articles | Volume 20, issue 5
Atmos. Chem. Phys., 20, 3107–3134, 2020
https://doi.org/10.5194/acp-20-3107-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
Atmos. Chem. Phys., 20, 3107–3134, 2020
https://doi.org/10.5194/acp-20-3107-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 16 Mar 2020

Research article | 16 Mar 2020

Air quality in the eastern United States and Eastern Canada for 1990–2015: 25 years of change in response to emission reductions of SO2 and NOx in the region

Jian Feng et al.

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Bell, M. L., Dominici, F., Ebisu, K., Zeger, S. L., and Samet, J. M.: Spatial and temporal variation in PM2.5 chemical composition in the United States for health effects studies, Environ. Health Perspect., 115, 989–995, https://doi.org/10.1289/ehp.9621, 2007. 
Bloomer, B. J., Vinnikov, K. Y., Dickerson, R. R.: Changes in seasonal and diurnal cycles of ozone and temperature in the eastern U.S., Atmos. Environ., 44, 2543–2551, https://doi.org/10.1016/j.atmosenv.2010.04.031, 2010. 
Butler, T. J., Likens, G. E., Vermeylen, F. M., and Stunder, B. J. B.: The relation between NOx emissions and precipitation NO3- in the eastern USA, Atmos. Environ., 37, 2093–2104, https://doi.org/10.1016/S1352-2310(03)00103-1, 2003. 
Butler, T. J., Vermeylen, F. M., Rury, M., Likens, G. E., Lee, B., Bowker, G. E., and McCluney, L.: Response of ozone and nitrate to stationary source NOx emission reductions in the eastern USA, Atmos. Environ., 45, 1084–1094, https://doi.org/10.1016/j.atmosenv.2010.11.040, 2011. 
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In this study, we analyzed air concentration data on SO42-, NO3-, NH4+, HNO3, and SO2 measured by CASTNET in the US and by CAPMoN in Canada to reveal the temporal and spatial trends of air pollutants over the eastern US and Eastern Canada. We also explained (1) why the reductions of SO2 were faster than SO42- and (2) why NO3- did not decrease during the cold season except in the Midwest and southern Ontario despite NOx emissions being significantly reduced for the whole region.
In this study, we analyzed air concentration data on SO42-, NO3-, NH4+, HNO3, and SO2 measured...
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