2017-2021年西充县城区环境空气质量状况与变化趋势研究

Study on environmental air quality and change trend of Xichong County during 2017-2021

运用统计学分析方法对西充县城区2017-2021年环境空气污染物(SO_(2)、NO_(2)、CO、O_(3)、PM_(2.5)和PM_(10))浓度的年度、月份以及日变化趋势进行了统计分析。结果表明:西充县城区环境空气PM_(2.5)、PM_(10)、SO_(2)、NO_(2)、CO和O_(3)年浓总体呈下降趋势,降幅分别为36.9%、34.5%、61.0%、47.8%、37.5%和4.2%;PM_(2.5)、PM_(10)、NO_(2)和CO月均浓度变化趋势呈“U”型分布,各年的SO_(2)月变化规律不一致,但PM_(2.5)、PM_(10)、SO_(2)、NO_(2)和CO_(5)项污染物冬季的浓度较高,夏季最低;O_(3)月均浓度变化趋势总体呈“双峰”型分布,O_(3)月均浓度峰值出现在4-5月和8月,夏季的O_(3)浓度最高,冬季最低;受城区及周边居民生产和生活的影响,西充县城区环境空气PM_(2.5)、PM_(10)、NO_(2)和CO日变化曲线呈“双峰双谷”型,峰值浓度出现在早、晚交通高峰之后;SO_(2)受城区及周边散煤燃烧影响较大,SO_(2)日变化曲线无固定变化规律;O_(3)日变化曲线呈“单峰”型,峰值出现在白天下午16:00左右。后期,西充县需在生物质燃烧、机动车尾气、建筑施工扬尘、道路扬尘和生物质焚烧等方面加强管控。

The statistical analysis method was used to analyse the annual,monthly and diurnal curves of the concentrations of ambient air pollutants in Xichong County from 2017 to 2021.The results showed that the annual concentrations of ambient air PM_(2.5),PM_(10),SO_(2),NO_(2),CO and O_(3) in the urban area of Xichong County showed a downward trends as a whole,with the decreasing rate being 36.9%,34.5%,61.0%,47.8%,37.5%and 4.2%,respectively.The monthly concentrations of PM_(2.5),PM_(10),NO_(2) and CO showed U-shaped distribution,and the monthly variation of SO_(2) was inconsistent in each year.However,the concentrations of PM_(2.5),PM_(10),SO_(2),NO_(2) and CO were higher in winter and lowest in summer.The monthly change trend of O_(3) generally presented a"double peak"distribution.The peak concentrations of O_(3) occurred in April-May and August,and the concentrations of O_(3) were the highest in summer and the lowest in winter.Influenced by the production and life of urban residents,the diurnal variation curves of PM_(2.5),PM_(10),NO_(2) and CO showed a trend of two highs and two lows,and the peak concentrations appeared after the morning and evening traffic rush hours.The diurnal variation curve of SO_(2) showed the great differences among the different years due to the influence of scattered coal combustion in urban area of Xichong County.The diurnal variation curve of O_(3) showed a"single peak"type,and the peak appeared at about 16:00 pm in the daytime.In future,the biomass burning,vehicle exhaust,construction dust and road dust,etc.needs to be strong controlled in Xichong County.