Spatial-temporal characteristics of particulate matters and different formation mechanisms of four typical haze cases in a mountain city

Lu, Hua; Xie, Min; Liu, Xiaoran; Liu, Bojun; Liu, Chao; Zhao, Xiaoli; Du, Qizhen; Wu, Zheng; Gao, Yanghua; Xu, Lu

doi:10.1016/j.atmosenv.2021.118868

Cited by 11 publications

(19 citation statements)

References 70 publications

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“…As one of the four major economic circles in China, the Chengdu-Chongqing Economic Circle covers an area of about 220,000 km 2 , with 18 cities and more than 100 million inhabitants (Gong et al, 2021 ; Zhang et al, 2022a , 2022b ). The unique climatic features of the region are extremely low wind speeds (0.9–1.4 m/s), low boundary layer height, high relative humidity and frequent atmospheric inversions all year round (Liao et al, 2021 ; Lu et al, 2022a , 2022b ; Qiao et al, 2019a , 2019b ). In recent years, the economy of the Chengdu-Chongqing economic circle has expanded rapidly, and energy consumption has increased sharply, forming a situation of double-high compound pollution of particulate pollution and photochemical smog.…”

Section: Methodsmentioning

confidence: 99%

“…Chongqing (28 ◦ ~ 32 ◦ N, 105 ◦ ~ 110 ◦ E) is a mountainous megacity located on the eastern edge of SCB. It is the main economic, manufacturing and transportation center in the upper reaches of the Yangtze River (Chen et al, 2019a , 2019b ; Harper et al, 2021 ; Lu et al, 2022a , 2022b ). It is surrounded by mountains, and covers only 0.86% of the total land area of China, comprises more than 2.45% of the total population (Chen et al, 2019a , 2019b ; Harper et al, 2021 ; Lu et al, 2022a , 2022b ).…”

Section: Methodsmentioning

confidence: 99%

“…It is the main economic, manufacturing and transportation center in the upper reaches of the Yangtze River (Chen et al, 2019a , 2019b ; Harper et al, 2021 ; Lu et al, 2022a , 2022b ). It is surrounded by mountains, and covers only 0.86% of the total land area of China, comprises more than 2.45% of the total population (Chen et al, 2019a , 2019b ; Harper et al, 2021 ; Lu et al, 2022a , 2022b ). At present, the districts and counties in Chongqing have been divided into one district and two groups according to their regional functions (Fig.…”

Section: Methodsmentioning

confidence: 99%

“…While the overall air quality of the Chengdu-Chongqing Economic Circle is improved, it is necessary to strengthen the joint prevention and control of air pollution in areas with high pollution levels, especially the megacities of Chengdu and Chongqing. Chongqing is situated at the eastern edge of the Cheng-Yu region, surrounded by mountains and undulating terrain (Li et al, 2016 , 2021a , 2021b , 2021c ; Lu et al, 2022a , 2022b ). In addition, the land area of Chongqing is 5 times that of Beijing and 1.5 times that of the Guangdong-Hong Kong-Macao Greater Bay Area (Ding et al, 2022 ; Kuang et al, 2018 ).…”

Section: Introductionmentioning

confidence: 99%

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Long-Term Air Pollution Characteristics and Multi-scale Meteorological Factor Variability Analysis of Mega-mountain Cities in the Chengdu-Chongqing Economic Circle

Abdullah

Sobri

et al. 2023

Water Air Soil Pollut

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Currently, air quality has become central to global environmental policymaking. As a typical mountain megacity in the Cheng-Yu region, the air pollution in Chongqing is unique and sensitive. This study aims to comprehensively investigate the long-term annual, seasonal, and monthly variation characteristics of six major pollutants and seven meteorological parameters. The emission distribution of major pollutants is also discussed. The relationship between pollutants and the multi-scale meteorological conditions was explored. The results indicate that particulate matter (PM), SO 2 and NO 2 showed a “U-shaped” variation, while O 3 showed an “inverted U-shaped” seasonal variation. Industrial emissions accounted for 81.84%, 58% and 80.10% of the total SO 2 , NOx and dust pollution emissions, respectively. The correlation between PM2.5 and PM10 was strong ( R = 0.98). In addition, PM only showed a significant negative correlation with O 3 . On the contrary, PM showed a significant positive correlation with other gaseous pollutants (SO 2 , NO 2 , CO). O 3 is only negatively correlated with relative humidity and atmospheric pressure. These findings provide an accurate and effective countermeasure for the coordinated management of air pollution in Cheng-Yu region and the formulation of the regional carbon peaking roadmap. Furthermore, it can improve the prediction accuracy of air pollution under multi-scale meteorological factors, promote effective emission reduction paths and policies in the region, and provide references for related epidemiological research. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s11270-023-06279-8.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Long-Term Air Pollution Characteristics and Multi-scale Meteorological Factor Variability Analysis of Mega-mountain Cities in the Chengdu-Chongqing Economic Circle

Abdullah

Sobri

et al. 2023

Water Air Soil Pollut

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“…The YRD region is located adjacent to the North China Plain (NCP) and experiences complicated environmental pollution issues originating from dust plumes, biomass burning, photochemical reactions, and coal combustion [15]. The occurrence of severe haze episodes in the YRD region is one of these environmental pollution issues [16][17][18]. Haze is a condition that obstructs visual range and is defined as the weather phenomenon that leads to a reduction in atmospheric visibility caused by the accumulation of suspended solid or liquid fine particles [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal characterization of aerosols and trace gases over the Yangtze River Delta region, China: impact of trans-boundary pollution and meteorology

et al. 2022

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Background The spatiotemporal variation of observed trace gases (NO2, SO2, O3) and particulate matter (PM2.5, PM10) were investigated over cities of Yangtze River Delta (YRD) region including Nanjing, Hefei, Shanghai and Hangzhou. Furthermore, the characteristics of different pollution episodes, i.e., haze events (visibility < 7 km, relative humidity < 80%, and PM2.5 > 40 µg/m3) and complex pollution episodes (PM2.5 > 35 µg/m3 and O3 > 160 µg/m3) were studied over the cities of the YRD region. The impact of China clean air action plan on concentration of aerosols and trace gases is examined. The impacts of trans-boundary pollution and different meteorological conditions were also examined. Results The highest annual mean concentrations of PM2.5, PM10, NO2 and O3 were found for 2019 over all the cities. The annual mean concentrations of PM2.5, PM10, and NO2 showed continuous declines from 2019 to 2021 due to emission control measures and implementation of the Clean Air Action plan over all the cities of the YRD region. The annual mean O3 levels showed a decline in 2020 over all the cities of YRD region, which is unprecedented since the beginning of the China’s National environmental monitoring program since 2013. However, a slight increase in annual O3 was observed in 2021. The highest overall means of PM2.5, PM10, SO2, and NO2 were observed over Hefei, whereas the highest O3 levels were found in Nanjing. Despite the strict control measures, PM2.5 and PM10 concentrations exceeded the Grade-1 National Ambient Air Quality Standards (NAAQS) and WHO (World Health Organization) guidelines over all the cities of the YRD region. The number of haze days was higher in Hefei and Nanjing, whereas the complex pollution episodes or concurrent occurrence of O3 and PM2.5 pollution days were higher in Hangzhou and Shanghai. The in situ data for SO2 and NO2 showed strong correlation with Tropospheric Monitoring Instrument (TROPOMI) satellite data. Conclusions Despite the observed reductions in primary pollutants concentrations, the secondary pollutants formation is still a concern for major metropolises. The increase in temperature and lower relative humidity favors the accumulation of O3, while low temperature, low wind speeds and lower relative humidity favor the accumulation of primary pollutants. This study depicts different air pollution problems for different cities inside a region. Therefore, there is a dire need to continuous monitoring and analysis of air quality parameters and design city-specific policies and action plans to effectively deal with the metropolitan pollution.

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Spatial variation, multi-meteorological factors and potential source analysis of air pollutants in Chengdu megacity of Chengdu-Chongqing economic circle

Li,

Abdullah,

et al. 2024

Air Qual Atmos Health

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Spatial-temporal characteristics of particulate matters and different formation mechanisms of four typical haze cases in a mountain city

Cited by 11 publications

References 70 publications

Long-Term Air Pollution Characteristics and Multi-scale Meteorological Factor Variability Analysis of Mega-mountain Cities in the Chengdu-Chongqing Economic Circle

Long-Term Air Pollution Characteristics and Multi-scale Meteorological Factor Variability Analysis of Mega-mountain Cities in the Chengdu-Chongqing Economic Circle

Spatiotemporal characterization of aerosols and trace gases over the Yangtze River Delta region, China: impact of trans-boundary pollution and meteorology

Spatial variation, multi-meteorological factors and potential source analysis of air pollutants in Chengdu megacity of Chengdu-Chongqing economic circle

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