乌海市雾对空气质量的影响

Influence of Fog Weather on Air Quality in Wuhai City

使用乌海市环保局2015—2020年逐时污染物浓度资料、乌海机场逐时能见度、国家一般气象站逐时相对湿度气象要素资料,分析了乌海市雾与空气质量的变化和对空气质量的影响。结果表明:(1)空气质量指数(Air quality index,AQI)与雾日数变化整体趋势相反,但不完全呈负相关,还有其他影响因素,乌海市的雾具有湿度大、持续时间短的特征。(2)雾对空气质量有明显的影响,相对湿度<95%的雾,除持续时间长以外,均会使平均AQI值增加,加剧空气污染程度;而相对湿度≥95%的雾反而会减轻空气污染。但雾消散后的空气污染状况基本比雾出现前严重。乌海市雾出现时大气首要污染物以PM_(2.5)为主。

Based on hourly pollutant concentration data of Wuhai Environmental Protection Bureau from 2015 to 2020,hourly visibility data of Wuhai Airport and hourly relative humidity data of national general weather stations,the change of fog and air quality in Wuhai city and its influence on air quality were analyzed.The results showed that:(1) the Air quality index(AQI) was not completely negatively correlated with the overall trend of fog days,and there were other influencing factors.The fog in wuhai was characterized by high humidity and short duration.(2) Fog had a significant impact on air quality.Fog with relative humidity <95% would increase the average AQI value and aggravate air pollution except for a long duration;Fog with a relative humidity ≥95%reduced air pollution.But air pollution was worse after the fog had cleared than before.When wuhai fog appeared,PM_(2.5) was the main atmospheric pollutant.