Impact of Winter Transit Air Masses on the Sources and Composition Characteristics of Atmospheric Pollution in Hengyang.

Through the integration and analysis platform of particulate matter components, a preliminary comparison was conducted on the pollution contribution of the three winter transit air masses in December to environmental quality, and the changes and related relationships of water-soluble ions and particulate matter elements were analyzed. The results showed that winter transit air masses had a significant impact on the air quality in Hengyang. In the quantitative comparison of the primary pollutant contribution during the transit period of air masses, local sources and transit sources each accounted for half, and the impact of transit source on ambient air quality was much greater than that of seasonal base increase. Fine particulate matter was closely related to secondary ions, and particulate matter was closely related to primary ions. The transit of air masses promoted the improvement of secondary ion conversion rate, and the unit increment of fine particulate matter was greater than that of particulate matter. During the transit period, the mass concentrations of most water-soluble ions and most particulate matter elements maintained synchronous growth, with a superimposed effect. The composition ratio of organic carbon and nitrate ions increased, while the composition ratio of ammonia and sulfate ions decreased. Both disposable ions and secondary conversions in the composition of PM2 s had increases and decreases. The high conversion rate of nitrate and the high composition ratio of ammonia radical in Hengyang indicated that transportation source factors had a significant impact on the local environmental quality of Hengyang. [ABSTRACT FROM AUTHOR]