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With the rapid development of the economy, surface ozone (O3) has become one of the most critical pollutants which disturb urban air quality improvement and standard management. It is important to clarify the variation characteristics of urban surface O3 concentration and its influence factors for scientifically formulating early warning of O3 pollution and prevention and control schemes. In this paper, based on datasets of surface O3 concentration and meteorological data of Xinyang City during 2015~2019, the variation characteristics of surface O3 concentration and the influence of meteorological factors on it were analysed by using statistical analysis and path analysis. The results show that the annual mean O3 concentration of Xinyang City fluctuated “declining-rising-declining” from 2015 to 2019, and the annual average probability in exceedance of the Chinese grade I and II ambient air quality standards were 41.7% and 10.7%, respectively. The monthly variation of O3 concentration presented a significant M-type fluctuation, with the peak values appearing in May and September, respectively. The meteorological factors had different degrees of influence on O3 concentration, with the influence degree in order air temperature < sunshine duration < atmospheric pressure < relative humidity < precipitation < wind speed. The effects of air temperature and relative humidity on O3 were mainly reflected by direct effects, while that of sunshine duration, precipitation, and atmospheric pressure were mainly reflected through indirect effects.
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