The impacts of the meteorology features on PM2.5 levels during a severe haze episode in central-east China

Wang, Hong; Li, Jianghao; Peng, Yue; Zhang, Meng; Che, Huizheng; Zhang, Xiaoye

doi:10.1016/j.atmosenv.2018.10.001

Cited by 69 publications

(37 citation statements)

References 22 publications

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“…The low PBL increased atmospheric stability, the low wind speed made it worse for difficult dispersion of air pollutants Liu et al, 2017). High RH and temperature usually accelerate secondary PM formation by speeding up chemical reactions Wang et al, 2019a;Rahman et al, 2019). Thus, it is very important to quantify the contribution of meteorological conditions when deciding controlling efficiency.…”

Section: Role Of Meteorologymentioning

confidence: 99%

Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

Wang

Chen

Zhu

et al. 2020

Resources, Conservation and Recycling

626

527

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Section: Role Of Meteorologymentioning

confidence: 99%

Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

Wang

Chen

Zhu

et al. 2020

Resources, Conservation and Recycling

626

527

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“…Generally, heavy haze events occur in four source regions in China: the NCP in North China, the YRD in East China, the PRD in South China, and the Sichuan Basin (SB) in Southwest China ( Xu et al, 2016 ; Zhang et al, 2013 ). Governed by atmospheric circulation, the regional transport of PM 2.5 emitted from these source regions can deteriorate air quality in the downwind receptor regions, leading to regional haze pollution in a large area across Central-Eastern China (CEC) ( Li et al, 2013 ; Jiang et al, 2015 ; Bei et al, 2016 ; Chen et al, 2019 ; Wang et al, 2019 ). Haze pollution events in the NCP have been observed to mainly result from air pollutant accumulation under stable weather conditions in winter ( Zhao et al, 2013 ; Gao et al, 2015 ; Zhang et al, 2016 ).…”

Section: Introductionmentioning

confidence: 99%

Importance of meteorology in air pollution events during the city lockdown for COVID-19 in Hubei Province, Central China

Shen

Zhao

Wang

et al. 2021

Science of The Total Environment

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Compared with the 21-year climatological mean over the same period during 2000–2020, the aerosol optical depth (AOD) and Angstrom exponent (AE) during the COVID-19 lockdown (January 24–February 29, 2020) decreased and increased, respectively, in most regions of Central-Eastern China (CEC). The AOD (AE) values decreased (increased) by 39.2% (29.4%) and 31.0% (45.3%) in Hubei and Wuhan, respectively, because of the rigorous restrictions. These inverse changes reflected the reduction of total aerosols in the air and the contribution of the increase in fine-mode particles during the lockdown. The surface PM 2.5 had a distinct spatial distribution over CEC during the lockdown, with high concentrations in North China and East China. In particular, relatively high PM 2.5 concentrations were notable in the lower flatlands of Hubei Province in Central China, where six PM 2.5 pollution events were identified during the lockdown. Using the observation data and model simulations, we found that 50% of the pollution episodes were associated with the long-range transport of air pollutants from upstream CEC source regions, which then converged in the downstream Hubei receptor region. However, local pollution was dominant for the remaining episodes because of stagnant meteorological conditions. The long-range transport of air pollutants substantially contributed to PM 2.5 pollution in Hubei, reflecting the exceptional importance of meteorology in regional air quality in China.

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“…The quantitative contribution of meteorological conditions and emissions to regional PM 2.5 is basically reasonable and credible, but it is not completely accurate. Other meteorological factors within this study region, which includes some thermal circulations caused by pollutants transportation [37][38][39], atmospheric chemistry [40,41], or thermal circulations [32] are also important when we consider the difference of PM 2.5 concentrations on the city scale. However, these have not been studied in depth because of their small influence on regional PM 2.5 concentration.…”

Section: Discussionmentioning

confidence: 99%

Contribution of Meteorological Conditions to the Variation in Winter PM2.5 Concentrations from 2013 to 2019 in Middle-Eastern China

Liu¹,

Wang²,

Shen³

et al. 2019

Atmosphere

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Severe air pollution events accompanied by high PM2.5 concentrations have been repeatedly observed in Middle-Eastern China since 2013 and decreased in recent years. The reason for this caused widespread attention. The month of January was selected to represent the winter season annual changes in the winter PM2.5 and meteorological conditions—including the upper-air meridional circulation index (MCI), winds at 700 and 850 hPa levels and surface meteorology—from 2013 to 2019. These conditions were analyzed to study the contribution of meteorology changing to the annual PM2.5 changing on the regional scale. Results show that, based on values of upper-level MCI, the years 2014, 2015, 2017, and 2019 were defined as meteorology-haze years and the years 2016 and 2018 were defined as meteorology-clean years. A change in meteorological conditions may lead to a 26% change in PM2.5 concentration between 2014 and 2013 (two meteorology-haze years) and 16–20% changes in PM2.5 concentration between meteorology-haze years and meteorology-clean years. Changes in pollutant emissions may cause 21–47% changes in PM2.5 concentration between each two meteorology-haze years. A comparison of two meteorology-clean years and pollutant emissions in 2018 may be reduced by 40% compared with 2016. Overall, changes in emissions had a greater influence on changes in PM2.5 compared with meteorological conditions.

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The impacts of the meteorology features on PM2.5 levels during a severe haze episode in central-east China

Cited by 69 publications

References 22 publications

Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

Severe air pollution events not avoided by reduced anthropogenic activities during COVID-19 outbreak

Importance of meteorology in air pollution events during the city lockdown for COVID-19 in Hubei Province, Central China

Contribution of Meteorological Conditions to the Variation in Winter PM2.5 Concentrations from 2013 to 2019 in Middle-Eastern China

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