Aerosol composition, sources, and secondary processing during autumn at a regional site in the Beijing–Tianjin

Wang, Y., Wang, Q., Tian, J., Zhang, Y., Wu, Y., Ran, W., . . . Cao, J. (2023). Aerosol composition, sources, and secondary processing during autumn at a regional site in the Beijing–Tianjin–Hebei region. Particuology, 75, 177-184. https://doi.org/10.1016/j.partic.2022.07.011

Aerosol composition, sources, and secondary processing during autumn at a regional site in the Beijing–Tianjin–Hebei region

Yichen Wang ^{a b}, Qiyuan Wang ^{b c *}, Jie Tian ^{b c}, Yong Zhang ^b, Yunfei Wu ^d, Weikang Ran ^b, Renjian Zhang ^{d e}, Junji Cao ^d *

a School of Public Policy and Administration, Northwestern Polytechnical University, Xi'an, 710129, China
b Key Laboratory of Aerosol Chemistry and Physics, State Key Laboratory of Loess and Quaternary Geology, Institute of Earth Environment, Chinese Academy of Sciences, Xi'an, 710061, China
c CAS Center for Excellence in Quaternary Science and Global Change, Xi'an, 710061, China
d Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, 100029, China
e Xianghe Observatory of Whole Atmosphere, Institute of Atmospheric Physics, Chinese Academy of Sciences, Xianghe County, Hebei Province, 065400, China

10.1016/j.partic.2022.07.011

Volume 75, April 2023, Pages 177-184

Received 8 April 2022, Revised 22 July 2022, Accepted 23 July 2022, Available online 5 August 2022, Version of Record 24 August 2022.

E-mail: wangqy@ieecas.cn; jjcao@mail.iap.ac.cn

Highlights

• Nitrate had the highest contribution to inorganics.

• Oxygenated organic aerosol was the largest organics.

• Enhanced nitrate formation from both photochemical and aqueous processing.

Abstract

Air pollution is serious during autumn in the Beijing–Tianjin–Hebei (BTH) region, but there are few studies that have utilized real-time observations and source apportionment of the autumn submicron aerosols in this region. In this study, a quadrupole aerosol chemical speciation monitor (Q-ACSM) was deployed for the real-time measurement of the non-refractory compositions of submicron aerosols (NR-PM₁) at a regional site (Xianghe) from October 3 to November 14, 2017. The results showed that nitrate was the largest inorganic aerosol, and the oxygenated organic aerosol (OOA) was the largest organic aerosol in Xianghe. Hydrocarbon-like OA (HOA) was the largest organic aerosol When the NR-PM₁ mass concentrations increased from the lowest to the highest bins, nitrate and biomass burning OA (BBOA) showed increasing trends in the suburban area. Enhanced nitrate formation during the pollution episodes resulted from both photochemical and aqueous processing. To reduce the particulate matter (PM_2.5) concentrations and eliminate heavy pollution episodes, control measures should focus on reducing NO_x, NH₃, and volatile organic compound (VOCs) emissions.

Graphical abstract

Keywords

Autumn; Beijing–Tianjin–Hebei region; Submicron aerosol; Organic sources; Control measures

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