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| Characteristics and main causes of ozone pollution in the Pearl River Delta in 2020 |
| CHEN Duo-hong1, SHEN Jin1, CHEN Yao-yao1, ZHOU Yan1, ZHANG Tao1, LIAO Tong1, LIAO Cheng-hao2, ZHAO Wen-long3, WANG Bo-guang3, LI Ting-yuan4 |
1. State Environmental Key Laboratory of Regional Air Quality Monitoring, Guangdong Environmental Protection Key Laboratory of Secondary Air Pollution Research, Guangdong Ecological Environmental Monitoring Center, Guangzhou 510308, China;
2. Guangdong Provincial Academy of Environmental Science, Guangzhou 510000, China;
3. Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China;
4. Guangdong Ecological Meteorology(Pearl River Delta Center for Environmental Meteorology Prediction and Warning), Guangzhou 510640, China |
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Abstract Based on the regulatory monitoring of atmospheric pollutants and components and meteorological data, the characteristics and main causes of ozone pollution in the Pearl River Delta (PRD) in 2020 were studied and analyzed. The results showed that ozone was the primary air pollutant in each month in the PRD in 2020. The annual concentration of ozone was 148mg/m3, decreased by 16% on a year-on-year basis, and the AQI compliance rate increased by 9.5%. The months with relatively serious ozone pollution in 2020 were April, August to November. The corresponding monthly ozone concentrations reached 175, 164, 166, 171 and 162mg/m3, respectively, all exceeding the national air quality standard of the secondary level of 160mg/m3. In other months, the ozone concentrations met the standard. From June to December, the ozone pollution conditions improved significantly compared in 2019, and thus increased the AQI compliance rate significantly year-on-year. In the first quarter of 2020, the emission of air pollutants decreased significantly due to the Spring Festival holiday and epidemic factors. However, the decrease in ozone concentration was not obvious, mainly because of a yearly increase in sunshine hours by about 19%. The comprehensive resumption of work and production in the PRD in April and the meteorological conditions with relatively strong radiation increased the ozone concentration by about 58% year-on-year. The pollution control measures taken in the “100-day service” from May to August and the “100-day action”from September to December effectively reduced the emission of ozone precursors. The concentration of NO2 decreased by 22%~23% and the concentration of VOCs decreased by 18%~26%, resulting in the concentration of ozone in these two stages decreasing by about 20% year-on-year.
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Received: 05 April 2022
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