The Relationship Between Relative Humidity(RH)and PM2.5 During Winter and Spring of Zhengzhou
[Purposes]By exploring the relationship between PM2.5 and RH during winter and spring(No-vember to April of the following year)of Zhengzhou from 2019 to 2023,suggestions for conducting PM2.5 monitoring and road watering operations were proposed.[Methods]Based on PM2.5 and meteorological data including RH,wind speed,precipitation,and temperature,the logistic multiple model was per-formed in STATA after setting the base group to analyze the trend of PM2.5 in accordance with RH.[Find-ings]The average concentration of PM2.5 reduced from 72.41μg/m3 to 61.42μg/m3,with a decrease of 15.2%.When RH was below 80%,the probability of PM2.5 falling in a larger concentration range in-creased with the growth of RH,which was of statistical significance.[Conclusions]Moisture in the air would cause PM2.5 precursors to form secondary particles and lead the fine particles to absorb water,which both contributed to the aggravation of air pollution.However,extremely high level of RH might re-sult in rainfall which would reduce PM2.5.It is suggested that the influence of RH should be fully elimi-nated during PM2.5 monitoring process,and meteorological conditions and air pollution conditions should be sufficiently considered before road watering operations.
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万方数据
