摘要
根据石柱县城区环境空气自动监测资料,分析2018—2020年O_(3)污染特征,结果表明:2018—2020年,石柱县O_(3)第90百分位平均浓度逐年下降趋势,20、30、40百分位浓度均为先下降后上升趋势,75、80、85、90百分位为均逐年下降趋势,平均每年下降3.5~4μg∕m^(3)。O_(3)超标主要分布在4-8月,O_(3)超标天数占全年超标天数比例由6.7%上升至27.8%,且污染程度均为轻度污染。2018和2019年O_(3)浓度最高出现在夏季,但2020年出现在春季;O_(3)月均浓度范围为40~119μg∕m^(3),变化趋势总体呈不规则的“M”型,1-4月呈上升趋势达到峰值,7-8月上升达到第二个峰值,随后下降达到谷值;O_(3)-1h浓度最低值出现在08∶00,最大值出现在16∶00前后。温度与O_(3)浓度呈正相关关系,与相对湿度、风速呈负相关。当日平均温度25~30℃,相对湿度50%~60%,风速1.5~2 m∕s时,应警惕臭氧污染。
Using automatic monitoring data of ambient air in the urban area of Shizhu County,the characteristics of O_(3)pollution from 2018 to 2020 were analyzed.The results showed that from 2018 to 2020,the 90th percentile average concentration of O_(3)in Shizhu County showed a decreasing trend year by year,while the 20th,30th,and 40th percentile concentrations showed a first decreasing and then increasing trend.The 75th,80th,85th,and 90th percentiles showed a decreasing trend year by year,with an average annual decrease of 3.5~4μg∕m^(3).O_(3)exceeding the standard is mainly distributed from April to August,and the proportion of O_(3)exceeding the standard days in the whole year has increased from 6.7%to 27.8%,and the degree of pollution is all mild pollution.The highest O_(3)concentration occurred in summer in 2018 and 2019,but in spring in 2020;The monthly average concentration of O_(3)ranges from 40 to 119μg∕m^(3),and the overall trend shows an irregular"M"shape.From January to April,it shows an upward trend and reaches its peak.From July to August,it rises to the second peak,and then decreases to the valley;The lowest concentration of O_(3)-1h appears at 08∶00,and the highest value appears around 16∶00.Temperature is positively correlated with O_(3)concentration,and negatively correlated with relative humidity and wind speed.When the average temperature of the day is 25~30℃,the relative humidity is 50%~60%,and the wind speed is 1.5~2 m∕s,one should be vigilant against ozone pollution.
作者
任林
马玉丽
周蓉
REN Lin;MA Yuli;ZHOU Rong(Ecological Environment Monitoring Station of Shizhu Tujia Autonomous County,Chongqing 409199,China)
出处
《环境影响评价》
2023年第5期122-126,共5页
Environmental Impact Assessment
关键词
石柱县
臭氧
污染特征
气象因素
Shizhu County
Ozone
pollution characteristics
meteorological factors
