2015～2018年太原市臭氧污染特征分析

基于太原市2015年1月~2019年2月的空气质量监测数据,分析了太原市近地面臭氧浓度变化特征。结果表明:2015~2018年太原市臭氧年平均浓度为78.42、82.33、95.87、103.77μg/m 3,臭氧浓度存在加速上升趋势;臭氧浓度逐日变化范围为5~270μg/m 3,共有181 d超过GB 3095—2012《环境空气质量标准》二级标准限值(160μg/m 3),超标时段主要集中于5~8月份;臭氧浓度日变化呈单峰型分布,峰值与谷值时段分别为14∶00~16∶00和6∶00~7∶00;臭氧浓度有明显的月变化规律,峰值与谷值时段分别为6~7月和1月、12月;臭氧浓度还表现出显著的季节变化规律,按浓度高低依次排序为夏季、春季、秋季和冬季;臭氧浓度与NO 2、CO、PM 2.5浓度呈负相关性。

Analysis of ozone pollution characteristics in Taiyuan City from 2015 to 2018

Based on the air quality monitoring data of Taiyuan City from January,2015 to February,2019,the characteristics of near-surface ozone concentration were analyzed.The results showed that there was an accelerated increase in ozone concentration in Taiyuan City from 2015 to 2018,and the annual average ozone concentrations were 78.42,82.33,95.87,and 103.77μg/m 3,respectively.The daily variation range of ozone concentration was 5 to 270μg/m 3.The data of 181 days in total exceeded the secondary standard limits(160μg/m 3)in Ambient Air Quality Standards(GB 3095—2012),and mainly concentrated in May to August.The daily variation of ozone concentration showed a unimodal distribution,and the peak and valley periods were 14∶00~16∶00 and 6∶00~7∶00,respectively.The ozone concentration changed every month regularly.The peak value appeared in June and July.The valley value appeared in January and December.The ozone concentration variation also showed a significant seasonal rule.the order sorted from high to low is summer,spring,autumn and winter.Moreover,the ozone concentration was negatively correlated with the concentrations of NO2,CO,and PM2.5.