沙尘天气对廊坊空气污染的影响分析
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Analysis on impact of sand and dust weather on air pollution in
ZHANG Xinmu， XU Min， LIU Qiqi
AbstractBased on the surface meteorological data of National Observing Station and the particulate matter mass concentration and AQI（air quality index）data of Municipal Bureau of Ecology and Environment，the characteristics of the air polution in from 1 December 2O2O to 30 November 2O23 are analyzed.The results are outlined below.（1）Of the sand and dust weather in ，72.7% （8/11） can cause a significant increase by over 8O in AQI，and 88.9% of the severe pollution days occur under the influence of sand and dust weather，mostly in spring. （2）The sand and dust processes on 15 March 2021 and 10-13 April 2023 belong to the upstream transmisson type with strong intensity and long duration. The mass concentrations of PM2.5 and PM10 （20 generally show a trend of rising and falling together，and the occurrence of sand and dust lags behind the occurrence of strong winds.（3）The sand and dust process on 4 March 2O22 belongs to the locally generated type，characterized by weak intensity，small impact range and short duration.At the same time，the change in the concentration of PM10 lags behind that of PM2.5 ，and the mass concentration of PM2.5 drops sharply when the concentration of PM10 suddenly rises. The sharp increase in the mass concentration of PM10 almost occurs synchronously with strong winds.（4） The analysis on the three typical sand and dust weather processes shows that the ratio between PM2.5 and PM10 corresponds well with the generation and disipation of sand and dust.（5）A higher wind speed is beneficial for the formation of sand and dust weather，while when the wind speed is excessively high ，itwill hinder the settling of sand and dust particles.The pollutants brought in bythe northerly and southwesterly winds have a greater impact on the air pollution in .
Keywordssand and dust；air pollutant；AQI （air quality index）； particulate mater mass concentration
0 引言
沙尘天气不仅会影响能见度，对生产生活、交通出行造成不良影响，还使许多的草场和农田受到风蚀，土地沙化面积不断扩大，使水土流失加速，加剧生态环境的恶化和环境污染，是影响我国区域空气质量的重要污染来源[1-2]。（剩余11046字）
