Based on the real-time data released by 17 atmospheric automatic stations in Chongqing,the pollution characteristics and variation trends of PM 2.5 and PM 10 and their correlations with meteorological factors from Jan...Based on the real-time data released by 17 atmospheric automatic stations in Chongqing,the pollution characteristics and variation trends of PM 2.5 and PM 10 and their correlations with meteorological factors from January 2014 to December 2018 were analyzed.The results show that the annual average mass concentration of PM 2.5 in Chongqing reduced from 65μg/m 3 in 2014 to 40μg/m 3 in 2018,and the annual average mass concentration of PM 10 decreased from 98μg/m 3 in 2014 to 64μg/m 3 in 2018.However,the annual average mass concentration of PM 2.5 in Chongqing from 2014 to 2018 and the annual average mass concentration of PM 10 from 2014 to 2016 exceeded the national level II standard,and the maximum exceeding standard rate was up to 0.86 and 0.40 times respectively.The monthly average mass concentration of PM 2.5 and PM 10 changed obviously,and the overall distribution was"U"-shaped.The ratio of PM 2.5 to PM 10 mass concentration ranged from 47.4%to 80.7%,with an average of 62.4%.The Pearson correlation coefficient between the mass concentration of PM 2.5 and PM 10 varied from 0.961 to 0.989,and there was a significant correlation at the confidence level of 0.01(bilateral).The mass concentration of PM 2.5 and PM 10 was extremely significantly correlated with average temperature,precipitation,and average air pressure,while there was no significant correlation between the mass concentrations of PM 2.5 and PM 10 and average relative humidity.The mass concentration of PM 2.5 and PM 10 was significantly correlated with sunshine duration.展开更多
文摘Based on the real-time data released by 17 atmospheric automatic stations in Chongqing,the pollution characteristics and variation trends of PM 2.5 and PM 10 and their correlations with meteorological factors from January 2014 to December 2018 were analyzed.The results show that the annual average mass concentration of PM 2.5 in Chongqing reduced from 65μg/m 3 in 2014 to 40μg/m 3 in 2018,and the annual average mass concentration of PM 10 decreased from 98μg/m 3 in 2014 to 64μg/m 3 in 2018.However,the annual average mass concentration of PM 2.5 in Chongqing from 2014 to 2018 and the annual average mass concentration of PM 10 from 2014 to 2016 exceeded the national level II standard,and the maximum exceeding standard rate was up to 0.86 and 0.40 times respectively.The monthly average mass concentration of PM 2.5 and PM 10 changed obviously,and the overall distribution was"U"-shaped.The ratio of PM 2.5 to PM 10 mass concentration ranged from 47.4%to 80.7%,with an average of 62.4%.The Pearson correlation coefficient between the mass concentration of PM 2.5 and PM 10 varied from 0.961 to 0.989,and there was a significant correlation at the confidence level of 0.01(bilateral).The mass concentration of PM 2.5 and PM 10 was extremely significantly correlated with average temperature,precipitation,and average air pressure,while there was no significant correlation between the mass concentrations of PM 2.5 and PM 10 and average relative humidity.The mass concentration of PM 2.5 and PM 10 was significantly correlated with sunshine duration.
