Meteorological mechanism for a large-scale persistent severe ozone pollution event over eastern China in 2017

Mao, J.; Wang, Lili; Chen, Lu; Liu, Jingda; Li, Mingge; Tang, Guiqian; Ji, Dongsheng; Zhao, Nan; Wang, Yuesi

doi:10.1016/j.jes.2020.02.019

Cited by 73 publications

(28 citation statements)

References 46 publications

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“…The case of O 3 should be analyzed separately. While the UV radiation produced in higher sunlight hours showed positive correlations with O 3 in different studies ( Mao et al., 2020 ), which is consistent with our results, higher temperatures are usually associated with higher O 3 pollution ( Dong et al., 2020 ; Mao et al., 2020 ). The mismatch of this association with the results in Table 3 should be highlighted and can be attributed to the short period of the data analyzed, i.e.…”

Section: Resultssupporting

confidence: 92%

“…On the one hand, dry and sunny weather leads to thermal inversion, which prevents vertical pollutant dispersion, so that their concentration increases, and they generate significant smog episodes. On the other hand, higher wind speed can reduce air pollution ( Mao et al., 2020 ; Radzka, 2020 ; Yousefian et al., 2020 ). Nevertheless, it is important to highlight that very low wind speed can also be associated with reduced PM in the air due to higher deposition ( Xu et al., 2020 ).…”

Section: Resultsmentioning

confidence: 99%

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Changes in air pollution during COVID-19 lockdown in Spain: A multi-city study

Briz‐Redón¹,

Belenguer-Sapiña

Serrano‐Aroca

2021

Journal of Environmental Sciences

157

126

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Highlights Variations in air quality in terms of CO, SO 2 , PM 10 , O 3 and NO 2 levels were studied. The lockdown of Spain was not able to reduce severe air pollution in all its forms. Significant reductions of NO 2 levels were achieved in most cities. Increases of O3 pollution levels were found in several cities.

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Changes in air pollution during COVID-19 lockdown in Spain: A multi-city study

Briz‐Redón¹,

Belenguer-Sapiña

Serrano‐Aroca

2021

Journal of Environmental Sciences

157

126

View full text Add to dashboard Cite

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“…The obtained findings are, on the whole, entirely compatible with relevant research. According to the studies by Mao et al ( 2020 ), Venter et al ( 2020 ), and Yousefian et al ( 2020 ), dry air causes thermal inversion, which stops vertical contaminants from spreading and increasing their accumulation. Furthermore, wind speed can help minimize emissions.…”

Section: Discussionmentioning

confidence: 99%

Analysis of changes in air pollution quality and impact of COVID-19 on environmental health in Iran: application of interpolation models and spatial autocorrelation

Keshtkar

heidari

Moazzeni

et al. 2022

Environ Sci Pollut Res

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In the global COVID-19 epidemic, humans are faced with a new challenge. The concept of quarantine as a preventive measure has changed human activities in all aspects of life. This challenge has led to changes in the environment as well. The air quality index is one of the immediate concrete parameters. In this study, the actual potential of quarantine effects on the air quality index and related variables in Tehran, the capital of Iran, is assessed, where, first, the data on the pollutant reference concentration for all measuring stations in Tehran, from February 19 to April 19, from 2017 to 2020, are monitored and evaluated. This study investigated the hourly concentrations of six particulate matters (PM), including PM2.5, PM10, and air contaminants such as nitrogen dioxide (NO 2 ), sulfur dioxide (SO2), ozone (O3), and carbon monoxide (CO). Changes in pollution rate during the study period can be due to reduced urban traffic, small industrial activities, and dust mites of urban and industrial origins. Although pollution has declined in most regions during the COVID-19 quarantine period, the PM2.5 rate has not decreased significantly, which might be of natural origins such as dust. Next, the air quality index for the stations is calculated, and then, the interpolation is made by evaluating the root mean square (RMS) of different models. The local and global Moran index indicates that the changes and the air quality index in the study area are clustered and have a high spatial autocorrelation. The results indicate that although the bad air quality is reduced due to quarantine, major changes are needed in urban management to provide favorable conditions. Contaminants can play a role in transmitting COVID-19 as a carrier of the virus. It is suggested that due to the rise in COVID-19 and temperature in Iran, in future studies, the effect of increased temperature on COVID-19 can be assessed.

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“…The results obtained mostly agree with other studies in the literature. Thus, regarding the positive association of PM 2.5 with temperature and sunlight hours, dry sunny weather frequently leads to prevent the vertical dispersion of pollutants due to thermal inversion [52] and increases their concentration, generating significant smog episodes. Indeed, sunny weather also favors photochemical reactions [24,53] while dry conditions prolong aerosols and atmospheric loadings [17].…”

Section: Global Effectsmentioning

confidence: 99%

A city-level analysis of PM2.5 pollution, climate and COVID-19 early spread in Spain

Briz‐Redón¹,

Belenguer-Sapiña

Serrano‐Aroca

2022

J Environ Health Sci Engineer

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PurpuseThe COVID-19 outbreak has escalated into the worse pandemic of the present century. The fast spread of the new SARS-CoV-2 coronavirus has caused devastating health and economic crises all over the world, with Spain being one of the worst affected countries in terms of confirmed COVID-19 cases and deaths per inhabitant. In this situation, the Spanish Government declared the lockdown of the country. Methods The variations of air pollution in terms of fine particulate matter (PM 2.5 ) levels in seven representative cities of Spain are analyzed here considering the effect of meteorology during the national lockdown. The possible associations of PM 2.5 pollution and climate with COVID-19 accumulated cases were also analyzed. Results While the epidemic curve was flattened, the results of the analysis show that the 4-week Spanish lockdown significantly reduced the PM 2.5 levels in only one city despite the drastically reduced human activity. Furthermore, no associations between either PM 2.5 exposure or environmental conditions and COVID-19 transmission were found during the early spread of the pandemic. Conclusions A longer period applying human activity restrictions is necessary in order to achieve significant reductions of PM 2.5 levels in all the analyzed cities. No effect of PM 2.5 pollution or weather on COVID-19 incidence was found for these pollutant levels and period of time.

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Meteorological mechanism for a large-scale persistent severe ozone pollution event over eastern China in 2017

Cited by 73 publications

References 46 publications

Changes in air pollution during COVID-19 lockdown in Spain: A multi-city study

Changes in air pollution during COVID-19 lockdown in Spain: A multi-city study

Analysis of changes in air pollution quality and impact of COVID-19 on environmental health in Iran: application of interpolation models and spatial autocorrelation

A city-level analysis of PM2.5 pollution, climate and COVID-19 early spread in Spain

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