Air Pollutants Variation Characteristics and Meteorological Factors in Ya'an During 2018 and 2022
The spatiotemporal variation characteristics of atmospheric pollutants,and the correlation between atmospheric pollutants and meteorological factors in Ya'an were respectively explored by mathematical statistics and Spearman correlation analysis,based on the environmental air quality and meteorological data of Ya'an from 2018 to 2022.Results show that:(1)From 2018 to 2022,the urban ambient air quality in Ya'an was acceptable,and the concentrations of SO2,NO2,CO,PM2.5,and PM10 decreased,while the O3-8h ascended.(2)Monthly average concentration indicated that the NO2,CO,PM2.5 and PM10 content showed a"U"shape.The lowest concentration was in July and August each year,and the highest was in December and January of the following year.Month-ly arerage concentration of O3-8h presented a parabolic shape with the highest concentration in July and August.(3)The atmospheric pollutants presented regional distribution characteristics,and the central urban area exhibited high atmospheric pollutants content,while southern and northern regions were opposite.(4)The correlation between meteorological factors and atmospheric pollutants var-ied with the seasons:NO2 and CO concentrations presented opposite trend with temperature and rainfall,while NO2 was significant-ly positively correlated with atmospheric pressure in spring and autumn.In summer,NO2 content exhibited opposite trend with tem-perature,and similar phenomenon was observed between PM10 and relative humidity.In autumn,O3-8h was significantly and positive-ly correlated with temperature and negatively with air pressure,and PM2.5&PM10 were opposite with temperature and rainfall.In winter,the correlation between O3-8h content and atmospheric pressure was negative,and the similar was recorded between PM2.5&PM10 and rainfall.SO2 concentration was rarely affected by various meteorological factors.In typical mountainous city,meteorologi-cal factors are important factors that change the concentration of atmospheric pollutants.
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