2015~2017年广西典型城市空气污染特征对比分析

Comparative Analysis of Air Pollution Characteristics in Typical Cities of Guangxi in the Past 2015~2017 Years

摘要: 通过中国空气质量在线监测分析平台最新数据，分析了2015年3月1日至2018年2月28日广西典型城市大气污染特征及变化趋势，并通过后向轨迹模式对污染物输送路径进行了统计分析。结果表明：广西各城市的污染物年均浓度在总体上呈上升趋势，但大气污染物浓度随年际变化的幅度较小，PM_2.5的年均浓度普遍高于国家二级标准；AQI、PM_2.5、PM₁₀、SO₂、CO、NO₂的浓度冬季高于夏季，其浓度冬季高于夏季的比例依次为：67.67%，134.06%，86.84%，26.25%，35.17%，76.98%，O₃的浓度夏季高于冬季，其夏季高于冬季的比例为7.65%；利用HYSPLIT4后向轨迹模型，模拟典型污染时段气团传输过程，初步判断广西典型城市大气污染物的传输路径主要来自东北、西北和西部方向。

Abstract: Based on the latest data released by China Air Quality Online Monitoring and Analysis Platform (http://www.aqistudy.cn/), the characteristics and trends of atmospheric pollution in typical cities of Guangxi from 2015 to 2017 were analyzed, and the pollutant transport paths were analyzed by backward trajectory model. The results showed that the annual average concentration of pollutants in Guangxi cities showed an upward trend on the whole, but the annual average concentration of PM_2.5 was generally higher than the national secondary standard; the air pollution in winter was more serious than that in summer, and the concentrations of AQI, PM_2.5, PM₁₀, SO₂, CO and NO₂ were higher than those in summer. The proportions in summer were 40.36%, 57.28%, 46.48%, 20.79%, 26.02%, 43.50% and the proportions in summer were 7.65% and 7.65%, respectively. The air mass transport process in typical pollution periods was simulated by using the backward air mass trajectory model to preliminarily judge the atmospheric characteristics of typical cities in Guangxi. The transport path of pollutants mainly comes from northeast, northwest and west directions.