【摘要】 选取2015～2018年南充市南部县空气质量监测数据进行了分析,研究了南部县近四年环境空气质量变化趋势。结果表明:南部县2015～2018年环境空气质量总共1232 d达标,达标率（优和良的天数占比）87.6%。环境空气质量首要污染物为二氧化硫（SO₂）、二氧化氮（NO₂）、可吸入颗粒物(PM₁₀)、臭氧（O₃）和细颗粒物(PM_2.5),出现天数占比分别为0.2%、4.7%、39.6%、17.3%、38.3%。环境空气污染物随季节变化而变化,其中污染最严重的为冬季。2015～2018年SO₂年均浓度、NO₂年均浓度、O₃日最大8 h第90百分位数和一氧化碳（CO）日均第95百分位数均达到二级标准限值;PM_2.5年均浓度均超过二级标准限值,2018年PM₁₀年均浓度达到二级标准限值;2015～2017年PM₁₀年均浓度均超过二级标准限值。南部县2015～2018年环境空气质量综合指数呈先升高后降低趋势。以期为南部县今后改善大气环境,完成环境保护目标,主要污染物减排提供参考依据。更多还原

【Abstract】 In this paper, the change trend of environmental air quality in Nanbu County in recent four years are analyzed by using the air quality monitoring data of Nanbu County from 2015 to 2018. The results showed that The air quality reached the standard of 1232 days from 2015 to 2018 in Nanbu county, and the rate of reaching the standard was 87.6%. The sulfur dioxide（SO₂）, nitrogen dioxide（NO₂）, respirable particulate matter(PM₁₀), ozone（O₃） and fine particulate matter(PM_2.5) were primary pollutants, whichthe days appearing was 0.2%, 4.7%, 39.6%, 17.3%, and 38.3%, respectively. Environmental air pollutants vary with seasons, among which winter is the most serious. Both the average annual concentration of SO₂, NO₂, 90 th percentile per day and 95 th percentile per day of CO reached the second standard of national standard from 2015 to 2018. The average annual concentration of PM_2.5 did not meet the second standard of national standard.The annual concentration of PM₁₀ in 2018 was up to the second standard of national standard, and the average annual concentration of PM₁₀ in 2015-2017 was not up to the second standard of national standard. From 2015 to 2018, the comprehensive index of environmental air quality in Nanbu County increased first and then decreased. This study provides a reference for Nanbu County to improve the atmospheric environment, achieve the goal of environmental protection and reduce the emission of major pollutants in the future.更多还原