Atmospheric photochemistry and secondary aerosol formation of urban air in Lyon, France

Sbai, Salah Eddine; Li, Chunlin; Boréave, A.; Charbonnel, N.; Perrier, S.; Vernoux, P.; Bentayeb, Farida; George, Christian; Gil, Sonia

doi:10.1016/j.jes.2020.06.037

Cited by 21 publications

(8 citation statements)

References 61 publications

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“…Due to strict norms, the supply of goods like LPG cylinders in rural areas was disturbed and trudge marches by laborers due to the lack of availability of public transport could be possible reasons for increasing household consumption of solid biofuel ( Ravindra et al, 2021 ). In factor 2, the highest contribution from O₃, NOx, SO₂, and toluene presents the photochemical reaction and formation of secondary aerosol ( Sbai et al, 2021 ). The identical period in 2018 and 2019 shows the same factor loading as Period B, but NOx contribution was high in factor 1 during 2018–19.…”

Section: Resultsmentioning

confidence: 99%

Drivers of air pollution variability during second wave of COVID-19 in Delhi, India

Saharan¹,

Kumar²,

Tripathy³

et al. 2022

Urban Climate

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To curb the 2nd wave of COVID-19 disease in April–May 2021, a night curfew followed by full lockdown was imposed over the National Capital Territory, Delhi. We have analyzed the observed variation in pollutants and meteorology, and role of local and transboundary emission sources during night-curfew and lockdown, as compared to pre-lockdown period and identical periods of 2020 lockdown as well as of 2018 and 2019. In 2021, concentration of pollutants (except O₃, SO₂, and toluene) declined by 4–16% during night-curfew as compared to the pre-lockdown period but these changes are not statistically significant. During lockdown in 2021, various pollutants decreased by 1–28% as compared to the night-curfew (except O₃ and PM₂.₅), but increased by 31–129% compared to the identical period of 2020 lockdown except O₃. Advection of pollutants from the region of moderate lockdown restrictions and an abrupt increase in crop-residue burning activity (120–587%) over Haryana and Punjab increased the air pollution levels over NCT during the lockdown period of 2021 as compared to 2020 in addition to a significant contribution of long-range transport. The increase in PM₂.₅ during the lockdown period of 2021 compared to 2020 might led to 5–29 additional premature mortalities.

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Section: Resultsmentioning

confidence: 99%

Drivers of air pollution variability during second wave of COVID-19 in Delhi, India

Saharan¹,

Kumar²,

Tripathy³

et al. 2022

Urban Climate

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“…Photochemistry can be a significant contributor to PM formation, especially under high ozone levels, because O 3 can be converted to OH radicals in the atmosphere in the presence of humidity. OH radicals react with VOC and BVOC and lead to the formation of secondary aerosols that represent a significant fraction of PM 2.5 ( Ortega et al, 2016 ; Sbai and Farida, 2019 ; Sbai et al, 2021a ). However, the contributions of photochemistry to PM 2.5 during the three periods were not as much as expected.…”

Section: Resultsmentioning

confidence: 99%

Integrated process analysis retrieval of changes in ground-level ozone and fine particulate matter during the COVID-19 outbreak in the coastal city of Kannur, India

Ye¹,

Rupakheti²,

Huang³

et al. 2022

Environmental Pollution

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“…In addition, Wu et al 2019 was study meteorological effect on PM 2.5 using GAM model and show a positive correlation between RH and PM 2.5 . The relationship between (SAT & Irradiance) and (PM) exhibits the role of photochemistry in the formation of PM especially during emission reduction, this result can be due to the rise in temperature that can leads to increase in precursor gases emission like VOC and BVOC and oxidants (O 3 and OH radical) that can promotes the formation of PM by secondary pathway (Friedman et al 2016 ; Sbai et al 2021a ). Negative value of NW10M represents SW10M and shows inverse correlation with PM.…”

Section: Resultsmentioning

confidence: 99%

Atmospheric pollutants response to the emission reduction and meteorology during the COVID-19 lockdown in the north of Africa (Morocco)

Sbai

Bentayeb

Yin

2022

Stoch Environ Res Risk Assess

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Climate and air quality change due to COVID-19 lockdown (LCD) are extremely concerned subjects of several research recently. The contribution of meteorological factors and emission reduction to air pollution change over the north of Morocco has been investigated in this study using the framework generalized additive models, that have been proved to be a robust technique for the environmental data sets, focusing on main atmospheric pollutants in the region including ozone (O 3 ), nitrogen dioxide (NO 2 ), sulfur dioxide (SO 2 ), particulate matter (PM 2.5 and PM 10 ), secondary inorganic aerosols (SIA), nom-methane volatile organic compounds and carbon monoxide (CO) from the regional air pollution dataset of the Copernicus Atmosphere Monitoring Service. Our results, indicate that secondary air pollutants (PM 2.5 , PM 10 and O 3 ) are more influenced by metrological factors and the other air pollutants reported by this study (NO 2 and SO 2) . We show a negative effect for PBHL, total precipitation and NW10M on PM (PM 2.5 and PM 10 ) , this meteorological parameters contribute to decrease in PM 2.5 by 9, 2 and 9% respectively, before LCD and 8, 1 and 5% respectively during LCD. However, a positive marginal effect was found for SAT, Irradiance and RH that contribute to increase PM 2.5 by 9, 12 and 18% respectively, before LCD and 17, 54 and 34% respectively during LCD. We found also that meteorological factors contribute to O 3 , PM 2.5 , PM 10 and SIA average mass concentration by 22, 5, 3 and 34% before LCD and by 28, 19, 5 and 42% during LCD respectively. The increase in meteorological factors marginal effect during LCD shows the contribution of photochemical oxidation to air pollution due to increase in atmospheric oxidant (O 3 and OH radical) during LCD, which can explain the response of PM to emission reduction. This study indicates that PM (PM 2.5 , PM 10 ) has more controlled by SO 2 due to the formation of sulfate particles especially under high oxidants level. The positive correlation between westward wind at 10 m (WW10M), Northward Wind at 10 m (NW10M) and PM indicates the implication of sea salt particles transported from Mediterranean Sea and Atlantic Ocean. The Ozone mass concentration shows a positive trend with Irradiance, Total and SAT during LCD; because temperature and irradiance enhance tropospheric ozone formation via photochemical reaction.This study shows the contribution of atmospheric oxidation capacity to air pollution change. Supplementary Information The online version co...

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Atmospheric photochemistry and secondary aerosol formation of urban air in Lyon, France

Cited by 21 publications

References 61 publications

Drivers of air pollution variability during second wave of COVID-19 in Delhi, India

Drivers of air pollution variability during second wave of COVID-19 in Delhi, India

Integrated process analysis retrieval of changes in ground-level ozone and fine particulate matter during the COVID-19 outbreak in the coastal city of Kannur, India

Atmospheric pollutants response to the emission reduction and meteorology during the COVID-19 lockdown in the north of Africa (Morocco)

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