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- W2358397296 abstract "To understand the concentrations and sources of atmospheric pollutants in urban Chengdu,Sichuan,the observations of SO2,NO2,O3,PM2.5,PM10 and CO,along with meteorological factors,were conducted at three stations of Shilidian,Liangjiaxiang and Caotangsi,from June 1 to August31,2013. The results showed that there were 22%,37% and 42% of the days with O3 hourly concentration exceeding the National Air Quality Standard of GradeⅡ at the above three sites,respectively. The particulate pollution was also serious at the above three sites,and the frequencies of days with excessive concentrations were 13%,8% and 3% for PM10,and 34%,27% and 26% for PM2.5,respectively. The peaks of NO2 and CO concentrations in the morning and night were due to the vehicles emission and the mixing layer height. However,the concentrations of O3 maximized at noon because of strong ultraviolet radiation. In addition,PM2.5and PM10 had the diurnal variation of highest in the morning and lowest in the afternoon as a result of morning rush hours and afternoon favorable diffusion conditions. We also found that the concentrations of O3,PM2.5and PM10 at weekend were higher than on weekdays,while the reverse is true for SO2,NO2 and CO. Finally,the preliminary analysis suggested that the atmospheric pollution in urban Chengdu was related to local emission and regional transport. For example,PM10 and NO2were controlled by local sources,whereas PM2.5,SO2 and O3were influenced by regional transport." @default.
- W2358397296 created "2016-06-24" @default.
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- W2358397296 date "2015-01-01" @default.
- W2358397296 modified "2023-09-25" @default.
- W2358397296 title "Temporal and spatial variations of atmospheric pollutants in urban Chengdu during summer" @default.
- W2358397296 hasPublicationYear "2015" @default.
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