[Characteristics and Sources of PM Pollution During Winter in Handan City from 2016 to 2020].

To explore the characteristics and sources of PM pollution in winter of Handan City in the past five years, PM samples were collected in winter of 2016 to 2020, and eight types of water-soluble inorganic ions were analyzed. The principal component analysis(PCA) model was used to analyze the types of pollution sources, and the backward trajectory and potential source contribution factor(PSCF) were used to simulate the transport trajectory and pollution sources. The results showed that the PM concentration in winter of 2018 was the highest, increasing by 60.

[Chemical Characteristics and Sources of Atmospheric Aerosols in the Surrounding District of a Heavily Polluted City in the Southern Part of North China].

In order to explore the chemical composition and source profiles of atmospheric particulate matter in winter in the northern area of Handan, a heavily polluted city in the southern part of North China, PM and PM samples were collected and analyzed from November 23 to December 12, 2020. During the observation period, the daily average (PM)and (PM) were 114.53 μg·m and 124.