Concentration and Isotopic Composition of Atmospheric Ammonia Throughout the Urban Mixing Layer in Response to Extreme Emission Reduction DOI
Yunhua Chang, Lin Cheng, H. Yu

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 21, 2024

Here, we investigate the vertical distribution of ammonia (NH3) and its nitrogen isotopic composition (δ15N-NH3) at nine heights along Shanghai Tower (632 m a.g.l.), world's highest in situ research platform urban areas that recently established. Both NH3 levels δ15N-NH3 values, all heights, were highly responsive to China's COVID-19 shutdown, N shifts consistent with shutdown-associated reduction combustion-related emissions early 2020. Despite fact source partitioning did not greatly change transect, observed abundance continuously increased from ground upper mixing layer (∼570 m). Supported by chemical transport-model simulations auxiliary field measurements, our data indicate transport represents an important modulating control regards pattern concentrations δ15N-NH3.

Language: Английский

Underestimated Industrial Ammonia Emission in China Uncovered by Material Flow Analysis DOI
Peilin Chen, Qin’geng Wang

Environmental Pollution, Journal Year: 2025, Volume and Issue: unknown, P. 125740 - 125740

Published: Jan. 1, 2025

Language: Английский

Citations

0
Source identification of ultrafine particulate matter and ammonia emissions in the metropolitan area DOI Open Access

Jaeseok Heo,

Pilho Kim,

Jongsung Park

et al.

Environmental Engineering Research, Journal Year: 2024, Volume and Issue: 30(1), P. 240074 - 0

Published: May 22, 2024

Previous studies have estimated the sources of particulate matter in atmosphere. Among these, studying secondary aerosols harmful to human health is important. However, there a lack research on ammonia (NH3), precursor aerosol formation. This study uses positive matrix factorization (PMF) model and conditional bivariate probability function (CBPF) estimate ammonia. The results showed that about 40% PM2.5 mass at both sites was attributable aerosol. To emission contribute generation aerosols, CBPF utilized compare characteristics categorized pollution ammonia, it found SMA had similar trends industry, road dust, oil combustion, biomass while GRA combustion vehicle (diesel). Considering from these two regions, metropolitan area more likely be emitted daily activities than long distances. demonstrate major role ambient concentrations can help develop effective management strategies policies for air mitigation.

Language: Английский

Citations

2
Atmospheric brown carbon in China haze is dominated by secondary formation DOI
Xiaodi Liu, Can Wu, Zheng Li

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 945, P. 173901 - 173901

Published: June 14, 2024

Language: Английский

Citations

0
PM2.5 Concentration Gap Reduction between Typical Urban and Nonurban China from 2000 to 2023 DOI
Linhao Guo, Xuemei Wang, Alexander Baklanov

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 11, 2024

Since 2013, stringent clean air initiatives have significantly reduced atmospheric pollutant emissions in China, improving quality and altering the spatiotemporal patterns of pollution. Utilizing fine particulate matter (PM2.5) its chemical composition data from 2000 to 2023, we observed a reduction disparity PM2.5 concentrations between urban nonurban areas. This is linked stricter emission controls areas relocation some sources However, specific constituents driving factors behind these changes remain be fully elucidated. By analyzing proportions components major cities such as Beijing, Shanghai, Guangzhou their surrounding areas, found that narrowing gap regions associated with convergence organic (OM) both results varying strategies tailored distinct characteristics pollution China. Coordinated governance should considered, along implementation integrated control mitigation measures for multiple pollutants further enhance

Language: Английский

Citations

0
Concentration and Isotopic Composition of Atmospheric Ammonia Throughout the Urban Mixing Layer in Response to Extreme Emission Reduction DOI
Yunhua Chang, Lin Cheng, H. Yu

et al.

ACS ES&T Air, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 21, 2024

Here, we investigate the vertical distribution of ammonia (NH3) and its nitrogen isotopic composition (δ15N-NH3) at nine heights along Shanghai Tower (632 m a.g.l.), world's highest in situ research platform urban areas that recently established. Both NH3 levels δ15N-NH3 values, all heights, were highly responsive to China's COVID-19 shutdown, N shifts consistent with shutdown-associated reduction combustion-related emissions early 2020. Despite fact source partitioning did not greatly change transect, observed abundance continuously increased from ground upper mixing layer (∼570 m). Supported by chemical transport-model simulations auxiliary field measurements, our data indicate transport represents an important modulating control regards pattern concentrations δ15N-NH3.

Language: Английский

Citations

0