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- Title
The promotion effect of nitrous acid on aerosol formation in wintertime Beijing: possible contribution of traffic-related emission.
- Authors
Yongchun Liu; Yusheng Zhang; Chaofan Lian; Chao Yan; Zeming Feng; Feixue Zheng; Xiaolong Fan; Yan Chen; Weigang Wang; Biwu Chu; Yonghong Wang; Jin Cai; Wei Du; Daellenbach, Kaspar R.; Juha Kangasluoma; Bianchi, Federico; Kujansuu, Joni; Tuukka Petäjä; Xuefei Wang; Bo Hu
- Abstract
Secondary aerosol is a major component of PM2.5, yet its formation mechanism in the ambient atmosphere is still an open question. Based on field measurements in downtown Beijing, we show that the photolysis of nitrous acid (HONO) could promote the formation of organic and nitrate aerosol in wintertime Beijing as evidenced by the growth of the mass concentration of organic and nitrate aerosols linearly increasing as a function of consumed HONO from early morning to noon. The increased nitrate also lead to the formation of particulate matter ammonium by enhancing the neutralization of nitric acid by ammonia. We further illustrate that over 50 % of the ambient HONO during pollution events in wintertime Beijing might be related to traffic-related emission including direct emission and formation via the reaction between OH and vehicle-emitted NO. Overall, our results highlight that the traffic-related HONO plays an important role in the oxidative capacity and in turn, contribute to the haze formation in winter Beijing. Mitigation of HONO and NOx emission from the vehicles might be an effective way to reduce secondary aerosol mass formation and severe haze events in wintertime Beijing.
- Subjects
BEIJING (China); NITROUS acid; WINTER; AEROSOLS; CARBONACEOUS aerosols; PARTICULATE matter; NITRIC acid; NEUTRALIZATION (Chemistry)
- Publication
Atmospheric Chemistry & Physics Discussions, 2020, p1
- ISSN
1680-7367
- Publication type
Article
- DOI
10.5194/acp-2020-150