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Discussion papers
https://doi.org/10.5194/acp-2018-851
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/acp-2018-851
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 22 Nov 2018

Research article | 22 Nov 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

Long-term measurements of ground-level ozone in Windsor, Canada – Part I. temporal variations and trends

Xiaohong Xu1, Tianchu Zhang1, and Yushan Su2 Xiaohong Xu et al.
  • 1Department of Civil and Environmental Engineering, University of Windsor, Windsor, Ontario, Canada
  • 2Ontario Ministry of the Environment, Conservation and Parks, Toronto, Ontario, Canada

Abstract. This study investigates temporal variations and long-term (1996–2015) trends of ground-level O3 (ozone) and its precursors, NOx (nitrogen oxides) and volatile organic compounds in Windsor, Ontario, Canada. During the 20-year study period, NOx, non-methane hydrocarbon concentrations and ozone formation potential decreased significantly by 58%, 61%, and 73%, respectively, while O3 concentrations increased by 33% (20.3ppb in 1996 vs. 27ppb in 2015). Our analysis revealed that the increased annual O3 concentrations in Windsor were due to (1) decreased O3 titration (by 50% between 1996 and 2015) owing to declining nitric oxide concentrations, which is suggested by a slightly decreasing trend of annual mean total O3 concentrations after the titration effect is removed, (2) reduced local photochemical production of O3, because of dwindling precursor emissions, and (3) increased background O3 level that has more impact on the low-to-median concentrations. The net effect of those factors is decreasing peak O3 levels during the smog season from May to September, but an overall increasing trend of annual means. These results indicate that the emission control measures are effective in reducing peak ozone concentrations. However, challenges in lowering annual O3 levels call for long-term collaborative efforts in the region and around the globe.

Xiaohong Xu et al.
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Status: open (until 17 Jan 2019)
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Short summary
This study investigates temporal variations and long-term trends of O3 (ozone) and its precursors in Windsor, Canada. During the 1996–2015 study period, NOx (nitric oxides) and non-methane hydrocarbon concentrations decreased by 58 % and 61 % respectively. Annual O3 concentrations increased by 33 %, due to (1) decreased O3 titration owing to declining NOx concentrations, (2) reduced local photochemical production of O3 due to dwindling precursor emissions, (3) increased background O3 level.
This study investigates temporal variations and long-term trends of O3 (ozone) and its...
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