Monthly Global Estimates of Fine Particulate Matter and Their Uncertainty

Environmental Science & Technology, Journal Year: 2021, Volume and Issue: 55(22), P. 15287 - 15300

Published: Nov. 1, 2021

Annual global satellite-based estimates of fine particulate matter (PM2.5) are widely relied upon for air-quality assessment. Here, we develop and apply a methodology monthly uncertainties during the period 1998–2019, which combines satellite retrievals aerosol optical depth, chemical transport modeling, ground-based measurements to allow characterization seasonal episodic exposure, as well aid management. Many densely populated regions have their highest PM2.5 concentrations in winter, exceeding summertime by factors 1.5–3.0 over Eastern Europe, Western South Asia, East Asia. In January, regional population-weighted mean exceed 90 μg/m3, with local approximately 200 μg/m3 parts Indo-Gangetic Plain. decreased 2010–2019 1.6–2.6 μg/m3/year, decreases beginning 2–3 years earlier summer than winter. We find evidence that global-monitored locations tend be cleaner large measurement gaps Global South. Uncertainty exhibit consistency observed differences between satellite-derived PM2.5. The evaluation uncertainty agglomerated values indicates hybrid provide precise regional-scale representation, residual inversely proportional sample size.

Language: Английский

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Meteorological influences on PM2.5 and O3 trends and associated health burden since China's clean air actions

The Science of The Total Environment, Journal Year: 2020, Volume and Issue: 744, P. 140837 - 140837

Published: July 13, 2020

Stringent clean air actions have been implemented to improve quality in China since 2013. In addition anthropogenic emission abatements, the changes may be modulated also by meteorology. this study, we developed multiple linear regression models quantify meteorological influences on trends fine particulate matter (PM2.5) and ozone (O3) concentrations associated health burden over three polluted regions of China, i.e., North Plain, Yangtze River Delta, Fen-wei Plain during 2014-2018, with a novel focus contributions most influential factors PM2.5 O3 as well PM2.5- O3-related mortality trends. The meteorology-driven for were -0.5~-2.0 (+0.7~+0.8) μg m-3 yr-1, contributing 10- 26% (12- 18%) observed five-year decreasing (increasing O3) decreased relative humidity (increased daytime planetary boundary layer height) was identified factor explained 55% (42%) largest trend among all seasons. decreases (increases led overall PM2.5-related O3-related) mortalities -2.2~-7.4 (+0.5~+0.9) thousand yr-1 regions, accounting (15- 31%) total (increasing) (O3-related) mortalities. results emphasize important role meteorology implications China's planning. particular, more efforts control should taken offset adverse effects caused

Language: Английский

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Predict the effect of meteorological factors on haze using BP neural network

Urban Climate, Journal Year: 2023, Volume and Issue: 51, P. 101630 - 101630

Published: July 31, 2023

Language: Английский

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Air pollution scenario over Pakistan: Characterization and ranking of extremely polluted cities using long-term concentrations of aerosols and trace gases

Remote Sensing of Environment, Journal Year: 2021, Volume and Issue: 264, P. 112617 - 112617

Published: July 27, 2021

Language: Английский

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Improved ANFIS model for forecasting Wuhan City Air Quality and analysis COVID-19 lockdown impacts on air quality

Environmental Research, Journal Year: 2020, Volume and Issue: 194, P. 110607 - 110607

Published: Dec. 17, 2020

Language: Английский

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Relationship between summertime concurring PM2.5 and O3 pollution and boundary layer height differs between Beijing and Shanghai, China

Environmental Pollution, Journal Year: 2020, Volume and Issue: 268, P. 115775 - 115775

Published: Oct. 27, 2020

Language: Английский

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Overviewing the air quality models on air pollution in Sichuan Basin, China

Chemosphere, Journal Year: 2021, Volume and Issue: 271, P. 129502 - 129502

Published: Jan. 8, 2021

Most developing countries in the world face common challenges of reducing air pollution and advancing process sustainable development, especially China. Air research is a complex system one main methods through numerical simulation. The quality model an important technical method, it allows researchers to better analyze pollutants different regions. In addition, SCB high-humidity foggy area, concentration atmospheric always high. However, on this region, four most polluted regions China, still lacking. Reviewing application models has not been reported thoroughly. To fill these gaps, review provides comprehensive narration about i) status SCB; ii) iii) problems prospects pollution. This paper may provide theoretical reference for prevention control other heavily areas China give some1inspirations forecast with terrain.

Language: Английский

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Investigating Changes in Ozone Formation Chemistry during Summertime Pollution Events over the Northeastern United States

Environmental Science & Technology, Journal Year: 2022, Volume and Issue: 56(22), P. 15312 - 15327

Published: Oct. 11, 2022

Understanding the local-scale spatial and temporal variability of ozone formation is crucial for effective mitigation. We combine tropospheric vertical column densities (VCDTrop) formaldehyde (HCHO) nitrogen dioxide (NO2), referred to as HCHO-VCDTrop NO2-VCDTrop, retrieved from airborne remote sensing TROPOspheric Monitoring Instrument (TROPOMI) with ground-based measurements investigate changes in precursors inferred chemical production regime on high-ozone days May–August 2018 over two Northeast urban domains. Over New York City (NYC) Baltimore/Washington D.C. (BAL/DC), increases across domain, but higher NO2-VCDTrop occurs mainly centers exceedance (when maximum daily 8 h average (MDA8) exceeds 70 ppb at any monitor region). The ratio proposed an indicator sensitivity local surface rates its precursors, generally days, implying a transition toward more NOx-sensitive that should lead efficacy NOx controls highest NYC BAL/DC. Warmer temperatures enhanced influence emissions boundary layer are accompanied by slower wind speeds BAL/DC stronger, southwesterly winds NYC.

Language: Английский

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PM2.5 and O3 concentration estimation based on interpretable machine learning

Atmospheric Pollution Research, Journal Year: 2023, Volume and Issue: 14(9), P. 101866 - 101866

Published: July 26, 2023

Language: Английский

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Integrated impacts of synoptic forcing and aerosol radiative effect on boundary layer and pollution in the Beijing–Tianjin–Hebei region, China

Atmospheric chemistry and physics, Journal Year: 2020, Volume and Issue: 20(10), P. 5899 - 5909

Published: May 18, 2020

Abstract. Rapid urbanization and industrialization have led to deterioration of air quality in the Beijing–Tianjin–Hebei (BTH) region due high loadings PM2.5. Heavy aerosol pollution frequently occurs winter, close relation planetary boundary layer (PBL) meteorology. To unravel physical processes that influence PBL structure BTH, this study combined long-term observational data analyses, synoptic pattern classification, meteorology–chemistry coupled simulations. During winter 2017 2018, Beijing Tangshan often experienced heavy PM2.5 simultaneously, accompanied by strong thermal inversion aloft. These concurrences different cities were primarily regulated large-scale conditions. Using principal component analysis with geopotential height fields at 850 hPa level during two typical patterns associated BTH identified. One is characterized a southeast-to-north pressure gradient across other eastern China. Both types feature warmer temperature 1000 m a.g.l., which could suppress development PBL. Under these unfavorable conditions, aerosols can modulate through radiative effect, was examined using numerical The effect significantly lower daytime cooling surface heating upper part PBL, leading quality. This PBL–aerosol feedback sensitive vertical structure, more effective when distribute

Language: Английский

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