Double-Edged Role of VOCs Reduction in Nitrate Formation: Insights from Observations during the China International Import Expo 2018.

Autor:	Zhang Y; Environment Research Institute, Shandong University, 250100 Ji'nan, China.; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Wang H; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Huang L; Environment Research Institute, Shandong University, 250100 Ji'nan, China., Qiao L; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Zhou M; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Mu J; Environment Research Institute, Shandong University, 250100 Ji'nan, China., Wu C; Key Lab of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 200241 Shanghai, China., Zhu Y; Environment Research Institute, Shandong University, 250100 Ji'nan, China.; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Shen H; Environment Research Institute, Shandong University, 250100 Ji'nan, China., Huang C; State Environmental Protection Key Laboratory of the Cause and Prevention of Urban Air Pollution Complex, Shanghai Academy of Environmental Sciences, 200233 Shanghai, China., Wang G; Key Lab of Geographic Information Science of the Ministry of Education, School of Geographic Sciences, East China Normal University, 200241 Shanghai, China., Wang T; Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, 999077 Hong Kong, China., Wang W; Environment Research Institute, Shandong University, 250100 Ji'nan, China., Xue L; Environment Research Institute, Shandong University, 250100 Ji'nan, China.
Jazyk:	angličtina
Zdroj:	Environmental science & technology [Environ Sci Technol] 2023 Oct 24; Vol. 57 (42), pp. 15979-15989. Date of Electronic Publication: 2023 Oct 11.
DOI:	10.1021/acs.est.3c04629
Abstrakt:	Aerosol nitrate (NO 3 - ) constitutes a significant component of fine particles in China. Prioritizing the control of volatile organic compounds (VOCs) is a crucial step toward achieving clean air, yet its impact on NO 3 - pollution remains inadequately understood. Here, we examined the role of VOCs in NO 3 - formation by combining comprehensive field measurements conducted during the China International Import Expo (CIIE) in Shanghai (from 10 October to 22 November 2018) and multiphase chemical modeling. Despite a decline in primary pollutants during the CIIE, NO 3 - levels increased compared to pre-CIIE and post-CIIE─NO 3 - concentrations decreased in the daytime (by -10 and -26%) while increasing in the nighttime (by 8 and 30%). Analysis of the observations and backward trajectory indicates that the diurnal variation in NO 3 - was mainly attributed to local chemistry rather than meteorological conditions. Decreasing VOCs lowered the daytime NO 3 - production by reducing the hydroxyl radical level, whereas the greater VOCs reduction at night than that in the daytime increased the nitrate radical level, thereby promoting the nocturnal NO 3 - production. These results reveal the double-edged role of VOCs in NO 3 - formation, underscoring the need for transferring large VOC-emitting enterprises from the daytime to the nighttime, which should be considered in formulating corresponding policies.
Databáze:	MEDLINE
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