[Analysis on the Characteristics of Oxidation Potential and Influence Sources of PM in Baoding City in Winter].

In order to explore the characteristics of PM oxidation potential and its impact sources in the suburbs of Baoding City in the winter of 2018, the dithiothreitol (DTT) method was used to determine the reactive oxygen species in PM. Pearson correlation was used to analyze the relationship between the chemical components in PM and the oxidation potential. PMF was used to analyze the pollution source of DTT.

Decrease of atmospheric black carbon and CO concentrations due to COVID-19 lockdown at the Mt. Waliguan WMO/GAW baseline station in China.

The Coronavirus Disease 2019 (COVID-19) lockdown policy reduced anthropogenic emissions and impacted the atmospheric chemical characteristics in Chinese urban cities. However, rare studies were conducted at the high mountain site. In this work, in-situ measurements of light absorption by carbonaceous aerosols and carbon dioxide (CO) concentrations were conducted at Waliguan (WLG) over the northeastern Tibetan Plateau of China from January 3 to March 30, 2020.