Interaction influence characteristics of air quality and aerosol properties between Beijing-Tianjing-Hebei (BTH) and Yangtze River Delta (YRD), China

Urban Climate, Journal Year: 2025, Volume and Issue: 61, P. 102395 - 102395

Published: April 4, 2025

Language: Английский

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Increased Aerosol Extinction Efficiency Hinders Visibility Improvement in Eastern China

Geophysical Research Letters, Journal Year: 2020, Volume and Issue: 47(20)

Published: Oct. 7, 2020

Abstract Though China has witnessed substantial particular matter pollution mitigation owing to the strict emission control in recent years, frequency of haze events with low visibility is not improved as much expected, especially cold seasons. Here, 6‐year wintertime observations, satellite retrievals, a thermodynamic model, and theoretical calculation were integrated better understand complex influence aerosol chemical composition hygroscopic behaviors on impairment. We found that proportion nitrate mass concentration increased by approximately 10% from 2013 2018. Such transition compositions together increasing ambient humidity past years jointly enhanced extinction efficiency, elevated played an increasingly critical role after 2017. The efficiency responsible for less despite large decrease concentrations eastern China.

Language: Английский

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Air pollutant variations in Suzhou during the 2019 novel coronavirus (COVID-19) lockdown of 2020: High time-resolution measurements of aerosol chemical compositions and source apportionment

Environmental Pollution, Journal Year: 2020, Volume and Issue: 271, P. 116298 - 116298

Published: Dec. 21, 2020

Language: Английский

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Aerosol Promotes Peroxyacetyl Nitrate Formation During Winter in the North China Plain

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(6), P. 3568 - 3581

Published: March 3, 2021

Peroxyacetyl nitrate (PAN) is an important indicator for photochemical pollution, formed similar to ozone in the photochemistry of certain volatile organic compounds (VOCs) presence nitrogen oxides, and has displayed surprisingly high concentrations during wintertime that were better correlated particulate rather than concentrations, which reasons remained unknown. In this study, observations PAN, VOCs, PM2.5, HONO, various trace gases investigated find relationship between aerosols PAN formation. Wintertime pollution was affirmed by (average: 1.2 ± 1.1 ppb, maximum: 7.1 ppb), despite low concentrations. determined its oxygenated VOC (OVOC) precursor NO/NO2 ratios can be well parameterized based on understanding their chemical relationship. Data analysis box modeling results suggest formation mostly contributed aging processes involving OH oxidation or photolysis ozonolysis pathways. Heterogeneous reactions have supplied key oxidants such as produced radicals upon photolysis, promoting OVOC thereby enhancing production, explaining observed PM2.5-OVOC-PAN intercorrelation. turn, parts these OVOCs might participate secondary aerosol, further aggravating haze a feedback. Low temperatures enable long-range transport downwind regions, how will impact capacity requires assessment future studies.

Language: Английский

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Quantifying the impacts of PM2.5 constituents and relative humidity on visibility impairment in a suburban area of eastern Asia using long-term in-situ measurements

The Science of The Total Environment, Journal Year: 2021, Volume and Issue: 818, P. 151759 - 151759

Published: Nov. 22, 2021

Language: Английский

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