Response of air pollution to meteorological conditions and socioeconomic activities associated to the COVID-19 outbreak in the Yangtze River Economic Belt

Atmospheric Environment, Journal Year: 2024, Volume and Issue: 323, P. 120390 - 120390

Published: Feb. 3, 2024

The Yangtze River Economic Belt (YREB) in China is one of the most populated regions world with fast growth economy and pollutant emissions from human activity, which has contributed to severe air-quality issues detrimental impact on health. China's measures control spread COVID-19 appear have resulted reductions energy consumption air emissions. However, there a scarcity studies that examine how natural meteorological socioeconomic factors collectively influence temporal spatial variations pollution YREB before during lockdown. In this study, we analyze spatiotemporal evolution pollutants period 2015–2022, estimate their dependence, clustering characteristics, spillover effects, response multiple variables. Significant decreasing trends were observed for major except O3. Although 24.44% reduction PM2.5 exposure outbreak 7.60% due clean measures, O3 warm seasons (April–September) increased by 13.74% 9.29% outbreak. At level, highest concentrations six recorded urban agglomerations lower or middle reaches River. A significant autocorrelation annual average was detected Meteorological conditions activities potentially had impacts concentrations. Prior implementation both dominated quality changes YREB. following epidemic, far outweighed index. finding study profound implications formulating emission policies customized China.

Language: Английский

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Comparative Analysis of Secondary Organic Aerosol Formation during PM2.5 Pollution and Complex Pollution of PM2.5 and O3 in Chengdu, China

Atmosphere, Journal Year: 2022, Volume and Issue: 13(11), P. 1834 - 1834

Published: Nov. 4, 2022

Nowadays, many cities in China are suffering from both fine particulate matter (PM2.5, with an aerodynamic diameter smaller than 2.5 µm) and ozone (O3) pollution. Secondary organic aerosol (SOA) is important component of PM2.5 closely related to the oxidation processes. To investigate characteristics formation pathways SOA during different types haze pollution episodes, carbonaceous components volatile compounds (VOCs) were monitored continuously Chengdu April 2019, when experienced not only (SPP) but also a complex O3 (CoP). In CoP episode, concentrations increased by 51.2% as compared SPP, positively correlated mass concentrations. These suggest that drove increase levels event some extent. The preliminary VOC source analysis based on feature ratio showed vehicle emission fuel volatilization sources main VOCs at this urban site. addition, coal emissions biomass burning contributors. High-carbon alkanes aromatic hydrocarbons significantly contributed formation. results provide understanding episodes Chengdu, which can help us further understand air typical region.

Language: Английский

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Simulations of Summertime Ozone and PM2.5 Pollution in Fenwei Plain (FWP) Using the WRF-Chem Model

Atmosphere, Journal Year: 2023, Volume and Issue: 14(2), P. 292 - 292

Published: Feb. 1, 2023

In recent years, ozone and PM2.5 pollution has often occured in the Fenwei Plain due to heavy emission favorable geographical conditions. this study, we used weather research forecasting/chemistry (WRF-Chem) model reproduce complex air of (FWP) from 20 May 29 2015. By comparing simulation results with observed data, found that although some cities there was a bias between simulated values captured trend pollutants generally. Moreover, according assessment parameters, validated deviations are acceptable. However, these WRF-Chem performed better on rather than PM2.5. Based validation, further analyzed pollutant distribution during contaminated period. Generally speaking, polluted area is mainly located Shanxi province Henan province. time period, occurred 27 28 May. addition, different formation conditions pollution, characteristics two were also be different. Ozone north FWP prevailing wind chemistry production. As for PM2.5, at night FWP. Furthermore, high areas closed sources FWP, showing correlation primary emissions.

Language: Английский

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Ozone Formation at a Suburban Site in the Pearl River Delta Region, China: Role of Biogenic Volatile Organic Compounds

Atmosphere, Journal Year: 2023, Volume and Issue: 14(4), P. 609 - 609

Published: March 23, 2023

Ozone (O3) is becoming an increasingly concerning air quality problem in China, and previous O3 control strategies focused primarily on reducing anthropogenic volatile organic compounds (AVOCs), while neglecting the role of biogenic VOCs (BVOCs) formation. In this study, a field campaign was conducted at suburban site Pearl River Delta region China with high BVOC emissions from 29 August to 3 September 2020. An empirical kinetic modelling approach (EKMA) showed that VOC-limited dominant feature for formation site. The relative incremental reactivity (RIR) values calculated by box model (AtChem2-MCM) revealed isoprene, formaldehyde, methylglyoxal acetaldehyde had highest RIRs. Simulation results also isoprene played substantial secondary carbonyls, especially contributing 32–92% formaldehyde production rate. Box simulations further during pollution period emissions, only near zero AVOC could prevent if levels nitrogen oxides (NOx) remained unchanged. suggest presence can greatly impact efforts AVOCs, particularly regions relatively NOx (up 51 ppbv study). long term, it may be essential choose low BVOC-emitting tree species urban planning address issue, as are projected become more significant source reactive enhanced AVOCs.

Language: Английский

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Measuring the synergy of air pollution and CO2 emission in Chinese urban agglomerations: an evaluation from the aggregate impact and correlation perspectives

Stochastic Environmental Research and Risk Assessment, Journal Year: 2024, Volume and Issue: 38(7), P. 2693 - 2709

Published: April 2, 2024

Language: Английский

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