Radiative Forcing and Health Impact of Aerosols and Ozone in China as the Consequence of Clean Air Actions over 2012–2017

Dang, Ruijun; Liao, Hong

doi:10.1029/2019gl084605

Cited by 107 publications

(72 citation statements)

References 57 publications

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“…Most cities in northern, western and southern regions are VOC limited (Sharma et al, 2016), thus this increase in O 3 could be due to more decrease in NOx compared to VOC. Furthermore, this could also be attributed to decrease in PM concentrations, which can result in more sunlight passing through atmosphere encouraging more photochemical activities and thus higher O 3 production (Dang and Liao, 2019;K. Li et al, 2019).…”

Section: Change In Concentrations Of Pollutantsmentioning

confidence: 99%

Effect of restricted emissions during COVID-19 on air quality in India

Sharma

Zhang

Anshika

et al. 2020

Science of The Total Environment

991

119

997

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The effectiveness and cost are always top factors for policy-makers to decide control measures and most measures had no pre-test before implementation. Due to the COVID-19 pandemic, human activities are largely restricted in many regions in India since mid-March of 2020, and it is a progressing experiment to testify effectiveness of restricted emissions. In this study, concentrations of six criteria pollutants, PM 10 , PM 2.5 , CO, NO 2 , ozone and SO 2 during March 16th to April 14th from 2017 to 2020 in 22 cities covering different regions of India were analysed. Overall, around 43, 31, 10, and 18% decreases in PM 2.5 , PM 10 , CO, and NO 2 in India were observed during lockdown period compared to previous years. While, there were 17% increase in O 3 and negligible changes in SO 2 . The air quality index (AQI) reduced by 44, 33, 29, 15 and 32% in north, south, east, central and western India, respectively. Correlation between cities especially in northern and eastern regions improved in 2020 compared to previous years, indicating more significant regional transport than previous years. The mean excessive risks of PM reduced by~52% nationwide due to restricted activities in lockdown period. To eliminate the effects of possible favourable meteorology, the WRF-AERMOD model system was also applied in Delhi-NCR with actual meteorology during the lockdown period and an un-favourable event in early November of 2019 and results show that predicted PM 2.5 could increase by only 33% in unfavourable meteorology. This study gives confidence to the regulatory bodies that even during unfavourable meteorology, a significant improvement in air quality could be expected if strict execution of air quality control plans is implemented.

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Section: Change In Concentrations Of Pollutantsmentioning

confidence: 99%

Effect of restricted emissions during COVID-19 on air quality in India

Sharma

Zhang

Anshika

et al. 2020

Science of The Total Environment

991

119

997

View full text Add to dashboard Cite

show abstract

“…3. The contrasting trend of O 3 may be due to more favorable conditions for photochemical reactions attributed to increased solar insolation and a decrease in NO 2 leading to changes in the photochemical reactions determining ozone formation and destruction (Sharma et al, 2016;Dang and Liao, 2019;Xu et al, 2020). The underlying chemistry between anthropogenic emissions like NO x in a VOC-limited environment and O 3 along with the meteorological parameters govern the accumulation of surface ozone in the atmosphere (Gorai et al, 2015;Saini et al, 2017).…”

Section: City Before Vs During Lockdown' 2020mentioning

confidence: 99%

Social and Travel Lockdown Impact Considering Coronavirus Disease (COVID-19) on Air Quality in Megacities of India: Present Benefits, Future Challenges and Way Forward

Jain

Sharma

2020

Aerosol Air Qual. Res.

234

230

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The coronavirus disease (COVID-19) created enormous pressure across the globe due to an increasing number of COVID-19 infected cases. All the governments' primary focus is to save humanity from this pandemic problem, and they have lockdown almost the entire nation to stop the spread of infection. This lockdown resulted in a considerable impact on the global as well as a local economy that will take a long time to perform with business as usual scenario. However, improvement in the air quality of the cities across the globe has emerged as a key benefit of this lockdown. Therefore, this study aims to assess the overall impact of social and travel lockdown in five megacities of India; Delhi, Mumbai, Chennai, Kolkata, and Bangalore. The study evaluated the spatiotemporal variations in five criteria pollutants over two time periods, i.e.

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“…The Clean Air Action Plan initiated in 2013 imposed rapid decreases in pollutant emissions (Chinese State Council, 2013) and resulted in large decreases in fine particulate matter (PM 2.5 ) concentrations (Zhai et al, 2019;. However, ozone increased by 1-3 ppb a −1 over the 2013-2017 period in the megacity clusters of eastern China (Lu et al, 2018(Lu et al, , 2020Li et al, 2019a), partly offsetting the health benefits gained from improved PM 2.5 (Dang and Liao, 2019;. Phase 2 of the Clean Air Action Plan, which began in 2018 (Chinese State Council, 2018), imposed new emission controls targeted at ozone.…”

Section: Introductionmentioning

confidence: 99%

Increases in surface ozone pollution in China from 2013 to 2019: anthropogenic and meteorological influences

Li¹,

Jacob²,

Shen³

et al. 2020

Atmos. Chem. Phys.

Self Cite

408

159

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Abstract. Surface ozone data from the Chinese Ministry of Ecology and Environment (MEE) network show sustained increases across the country over the 2013–2019 period. Despite Phase 2 of the Clean Air Action Plan targeting ozone pollution, ozone was higher in 2018–2019 than in previous years. The mean summer 2013–2019 trend in maximum 8 h average (MDA8) ozone was 1.9 ppb a−1 (p<0.01) across China and 3.3 ppb a−1 (p<0.01) over the North China Plain (NCP). Fitting ozone to meteorological variables with a multiple linear regression model shows that meteorology played a significant but not dominant role in the 2013–2019 ozone trend, contributing 0.70 ppb a−1 (p<0.01) across China and 1.4 ppb a−1 (p=0.02) over the NCP. Rising June–July temperatures over the NCP were the main meteorological driver, particularly in recent years (2017–2019), and were associated with increased foehn winds. NCP data for 2017–2019 show a 15 % decrease in fine particulate matter (PM2.5) that may be driving the continued anthropogenic increase in ozone, as well as unmitigated emissions of volatile organic compounds (VOCs). VOC emission reductions, as targeted by Phase 2 of the Chinese Clean Air Action Plan, are needed to reverse the increase in ozone.

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Radiative Forcing and Health Impact of Aerosols and Ozone in China as the Consequence of Clean Air Actions over 2012–2017

Cited by 107 publications

References 57 publications

Effect of restricted emissions during COVID-19 on air quality in India

Effect of restricted emissions during COVID-19 on air quality in India

Social and Travel Lockdown Impact Considering Coronavirus Disease (COVID-19) on Air Quality in Megacities of India: Present Benefits, Future Challenges and Way Forward

Increases in surface ozone pollution in China from 2013 to 2019: anthropogenic and meteorological influences

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