Study Of Surface O₃ And Its Precursors Of Beijing,Shanghai,Guanzhou And Their Surrounding Areas In 2017

With the rapid development of the city,the number of motor vehicles has increased rapidly,and the concentration of air pollutants in the city has also increased sharply,especially the regional pollution that O3 presents.In this paper,the O3,NO2,CO and meteorological data of the Beijing-Tianj in-Hebei region,the Yangtze River Delta region and the Pearl River Delta region in 2017 were used to research change characteristics of O3 and its precursors,and the change characteristics of near-surface O3 and its precursors of Beijing Shanghai Guangzhou and the surrounding areas were obtained.As the "Capital Economic Circle",Beijing-Tianjin-Hebei region is the most polluted area in China at this stage.The monthly variation of O3 concentration is a single peak structure in Beijing-Tianjin-Hebei region in 2017,and the seasonal variation is high in spring and summer and low in autumn and winter.O3 concentration was positively correlated with temperature,and negatively correlated with NO2 concentration and CO concentration.The correlation between O3 and N02 is higher than that of CO.When NO2 concentration is unstable,O3 concentration tends to be stable,but there is no such relationship between CO and O3.The weekend effect of the Beijing-Tianjin-Hebei region in summer is the most obvious,followed by spring and autumn,and the least obvious in winter,while the "weekend effect" of comprehensive O3 concentration is not so obvious during the year.The over-standard rate of O3 was highest in cloudy weather in Beijing.The world-class cities in the Yangtze River Delta region are densely populated with high traffic flow and pollution.The monthly variation of O3 concentration is a bimodal structure in the Yangtze River Delta region in 2017,and the seasonal variation is high in spring and summer,and low in autumn and winter.O3 concentration was positively correlated with temperature,and negatively correlated with the concentration of NO2 and CO.The correlation between O3 and NO2 is higher than that of CO.When NO2 concentration is unstable,O3 concentration tends to be stable,but there is no such relationship between CO and O3.The weekend effect in the Yangtze River Delta region is the most obvious in spring,followed by summer,autumn,and winter season,while the "weekend effect" of comprehensive O3 concentration is not so obvious during the year.And Shanghai has the highest rate of O3 exceeding the standard in sunny days.The over-standard rate of O3 was highest in sunny weather in Beijing.The Pearl River Delta region is a world-class innovation and entrepreneurship center which concentrated high-tech enterprises,causing the frequency of pollution problems in the Pearl River Delta increased.The monthly variation of O3 concentration is a multi-peak structure in the Pearl River Delta region in 2017,and the seasonal variation is high in spring and autumn,and low in summer and winter.O3 concentration was positively correlated with temperature without special weather effect,and negatively correlated with the concentration of NO2 and CO.The correlation between O3 and NO2 is higher than that of CO.When NO2 concentration is unstable,O3 concentration tends to be stable,but there is no such relationship between CO and O3.The weekend effect of the Yangtze River Delta region is the most obvious in spring,followed by summer,autumn and winter,while the "weekend effect" of comprehensive O3 concentration is not obvious during the year.The over-standard rate of O3 was highest in sunny weather in Guangzhou.