Source Apportionment Of Atmospheric Particulate Matter In Xingyang City

In recent years,with the development of the economy and the acceleration of urbanization,the problem of air pollution has become increasingly prominent.Particulate matter not only causes inconvenience to daily life,causes climate change,but also poses a certain threat to human health.This study selected Xingyang City State Control Point as a sampling point for the sampling point.The sampling time was from March 29 to April 5,2017 and November15 to November 21,2017.The monitoring and analysis of atmospheric particulate matter(PM_2.5 and PM₁₀)mass concentration and chemical composition characteristics,and source analysis using positive definite matrix factor method.As a basis for formulating the countermeasures for the prevention and control of atmospheric particulate matter pollution in Xingyang City,the source analysis results provide theoretical and data support for effectively controlling the pollution of atmospheric particulate matter in Xingyang City,and have important guiding significance for improving the atmospheric environment of Xingyang City.The results show that the particulate matter pollution in Xingyang City in autumn is lower than that in spring.NH₄⁺,Ca²⁺,NO₃^-and SO₄^2-are the four main water-soluble ions in particulate matter in spring and autumn,and the secondary ions are mainly distributed in fine particulate matter.The proportion of secondary particles in total ion concentration in spring is higher than that in autumn,and the SOR and NOR values in spring are higher than that in autumn,indicating that secondary pollution is more likely to occur in spring.The contribution of mobile sources during spring and autumn sampling is greater than that of nitrate-sulfur ratio.By analyzing the enrichment degree of elements in different seasons and periods,it is inferred that more than 9:30 am and 5:30 am coal and biomass combustion,more than17:30 building dust pollution and more than 1:30 automobile pollution in spring in Xingyang City.In autumn,the enrichment of elements is relatively high,which is greatly influenced by human activities.In autumn,the enrichment factor values of Zn decreased sharply between 14:00 and 22:00,and reached the highest value between 2:00in the morning.It is possible that there will be industrial participation in production activities or dredger trucks in the evening.Through the health risk assessment of particulate heavy metals in spring and autumn,it can be seen that Cr element has a certain carcinogenic risk,and as element has a prominent non-carcinogenic risk,which should be paid great attention to.Children and adults should strengthen prevention,wear masks and go out in less fog and haze.The main pollution sources of PM_2.5.5 are coal combustion?44.66%?,motor vehicle exhaust?16.38%?soil dust and industrial process sources?19.58%?,biomass combustion?12.99%?,secondary aerosol?39.04%?,coal combustion?29.33%?,soil dust?16.12%?and industrial process sources?12.41%?.Source analysis results show that dust,motor vehicle exhaust and secondary aerosol are the main pollution sources in Xingyang City.Therefore,measures such as reducing coal consumption,single and double vehicle use,daily sprinkler and so on can be taken to improve atmospheric conditions.