Seasonal influences on surface ozone variability in continental South Africa and implications for air quality

Atmospheric Chemistry and Physics
Tracey Leah LabanLauri Laakso

Abstract

Although elevated surface ozone (O3) concentrations are observed in many areas within southern Africa, few studies have investigated the regional atmospheric chemistry and dominant atmospheric processes driving surface O3 formation in this region. Therefore, an assessment of comprehensive continuous surface O3 measurements performed at four sites in continental South Africa was conducted. The regional O3 problem was evident, with O3 concentrations regularly exceeding the South African air quality standard limit, while O3 levels were higher compared to other background sites in the Southern Hemisphere. The temporal O3 patterns observed at the four sites resembled typical trends for O3 in continental South Africa, with O3 concentrations peaking in late winter and early spring. Increased O3 concentrations in winter were indicative of increased emissions of O3 precursors from household combustion and other low-level sources, while a spring maximum observed at all the sites was attributed to increased regional biomass burning. Source area maps of O3 and CO indicated significantly higher O3 and CO concentrations associated with air masses passing over a region with increased seasonal open biomass burning, which indicated CO associate...Continue Reading

References

Dec 22, 2009·Environmental Monitoring and Assessment·Miroslav JosipovicStuart J Piketh
Dec 23, 2015·Journal of Atmospheric Chemistry·Anne M ThompsonGlenn S Diskin

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Citations

Oct 30, 2020·Environmental Pollution·Katrina SharpsGina Mills
Mar 28, 2021·Journal of Environmental Management·Mingliang MaKaixu Bai
Jul 1, 2021·Environmental Science and Pollution Research International·Katrina SharpsHarry Harmens
Oct 22, 2020·Environmental Science & Technology·Alfred S BockarieA R MacKenzie

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