【摘要】 结合2018年北京市城区全年PM_2.5、气态前体物（SO₂、O₃、NO₂、CO）质量浓度数据和气象因素数据,分析了2018年北京市城区PM_2.5和气态前体物浓度季节与日变化特征。结果表明:2018年北京城区PM_2.5平均质量浓度为50.6μg/m³,灰霾污染事件频繁出现在春、秋、冬3个季节。SO₂、NO₂和CO与PM_2.5质量浓度变化趋势一致,PM_2.5质量浓度与风速呈负相关,相对湿度大于50%时,PM_2.5迅速形成和累积。从季节与日变化特征来看,SO₂、NO₂、O₃、PM_2.5浓度在不同季节均呈现不同的日变化特征。春季偏南风和偏东风相对应的PM_2.5浓度比较高,出现的雾霾污染事件较多。夏季雾霾污染事件多发生在南风和西风风向。更多还原

【Abstract】 The seasonal and diurnal variations of PM_2.5 and gaseous precursor concentrations（SO₂, O₃, NO₂, CO） in urban areas of Beijing in 2018 were analyzed and discussed in combination with the data of mass concentration and meteorological factors of PM_2.5 and gaseous precursor concentrations in urban areas of Beijing in 2018. The results showed that the average mass concentration of PM_2.5 in Beijing city was 50.6 ug/m³ in 2018, and the haze pollution events occurred frequently in spring, autumn and winter. SO₂, NO₂ and CO concentration are consistent with the change trend of PM_2.5 mass concentration. PM_2.5 mass concentration is negatively correlated with wind speed. When the relative humidity is more than 50%, PM_2.5 rapidly forms and accumulates. From the perspective of seasonal and diurnal variation characteristics, SO₂, NO₂,O₃ and PM_2.5 concentrations show different diurnal variation characteristics in different seasons. In spring, the concentration of PM_2.5 corresponding to southerly winds and easterly winds is relatively high, and there aremany haze pollution incidents. Summer haze pollution events occur in the south and west wind direction.更多还原