关键词: 臭氧, 污染过程, 气象条件

Abstract: Based on the monitoring data of air pollutants from Xingtai Ecological and Environment Bureau and the corresponding meteorological observation data, this article analyzed an ozone pollution process in Xingtai of Hebei Province during 10-24 June 2018. The results are as follows: (1) In the process of pollution, the trends of ozone concentration were the same at four monitoring points in Xingtai. The ozone mass concentration over Xingtai Teacher’s College was the highest, and it was the lowest in Environmental Protection Agency. The diurnal variation of ozone mass concentration showed a single peak, the lowest mass concentration appeared from 05:00 to 06:00 and the highest mass concentration appeared at 15:00. The diurnal variation of ozone mass concentration was the largest over Xingtai Teacher’s College, and it was the smallest in Environmental Protection Agency. (2) The hourly variations of ozone mass concentrations were approximate under different weather conditions. The diurnal variation presented “single peak”. The ozone mass concentration changed dramatically on sunny days, and the change was flat on rainy days. (3) Ozone mass concentration was positively correlated with average temperature, maximum temperature, minimum temperature, solar radiation and the average of wind speed. The highest correlation coefficient was between ozone mass concentration and maximum temperature. The negative correlation was between ozone and NO2, PM10, CO, PM2.5. (4) After a intense radiation, if the highest temperature was equal to or more than 29 ℃ and the relative humidity was between 30% and 60% with a southerly wind, the hourly average mass concentrations of ozone would exceed the standard easily from 12:00 to 19:00.

Key words: ozone mass concentration, pollution process, meteorological conditions