在不同相对湿度条件下雾对空气质量的影响

Fog Influence on Air Quality Under the Different Relative Humidity

城市中雾的出现一般会加重空气污染,但相关研究表明：雾对空气质量的影响并不是单一的,也有清除的作用.利用2002-2005年乌鲁木齐地区空气自动监测数据及相关气象数据,统计了乌鲁木齐地区雾日的出现频率和特点,分析了在不同的相对湿度条件下雾对地面大气污染的作用.选择典型性雾日对大气污染物（PM10、SO2、NO2）浓度变化进行讨论.结果表明：①相对湿度＞90%的雾出现频率最低,对各种大气污染物都有明显的清除作用;②相对湿度＜80%的雾出现频率高,对各种大气污染物的污染程度都有明显的加重作用;③相对湿度介于80%～90%之间的雾出现频率较高,它对于各种大气污染物的清除或污染加重作用各不相同.

In city if fog appears generally air pollution will become heavier, but the interrelated research shows that influence on air quality is no single and also has eliminating action. The article utilizes air auto - monitoring data and interrelated meteorological phenomena data of Urumqi Area from 2002 to 2005, statistics appearing frequency and character of foggy day in Urumqi Area and analyses fog does action for the earth＇ s surface air pollution under the different relative humidity, it selects typical foggy day＇ s air pollutant （PM10 , SO2, NO2 ） consistency changes to carry on discussion. The result shows：①~ The appearing frequency of relative humidity 〉 90% fog is the lowest and has clear eliminating action for each air pollutant; ②The appearing frequency of relative humidity 〈 80% fog is the highest and the pollution extent of each air pollutant has clearly becoming heavier action; ③The appearing frequency of relative humidity between 80% to 90% fog is the higher and it has different action of eliminating pollution of pollution becoming heavier of each air pollutant.