Elucidating the impacts of COVID-19 lockdown on air quality and ozone chemical characteristics in India

Roozitalab, Behrooz; Carmichael, G. R.; Guttikunda, Sarath; Abdi‐Oskouei, Maryam

doi:10.1039/d2ea00023g

Cited by 4 publications

(2 citation statements)

References 97 publications

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“…While there was a drop in electricity generation rates at the beginning of the lockdown periods, most of the power plants were running at business-as-usual setting, resulting in limited changes in the background SO 2 concentrations and the overall columnar density. The behaviour of ozone concentrations during and immediately after COVID-19 is still a topic of many on-going investigations [64,65]. One theory is that a drop in NO x emissions altered the local photochemistry to produce marginally more ozone during the lockdowns and subsequently settled back into the seasonal pattern.…”

Section: Source Apportionmentmentioning

confidence: 99%

What Is Polluting Delhi’s Air? A Review from 1990 to 2022

Guttikunda

Dammalapati²,

Pradhan³

et al. 2023

Sustainability

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Delhi’s annual average PM2.5 concentration in 2021–22 was 100 μg/m3—20 times more than the WHO guideline of 5 μg/m3. This is an improvement compared to the limited information available for the pre-CNG-conversion era (~30%), immediately before and after 2010 CWG (~28%), and the mid-2010s (~20%). These changes are a result of continuous technical and economic interventions interlaced with judicial engagement in various sectors. Still, Delhi is ranked the most polluted capital city in the world. Delhi’s air quality is a major social and political concern in India, often with questions regarding its severity and primary sources, and despite several studies on the topic, there is limited consensus on source contributions. This paper offers insight by reviewing the influence of Delhi’s urban growth since 1990 on pollution levels and sources and the evolution of technical, institutional, and legal measures to control emissions in the National Capital Region of Delhi.

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Section: Source Apportionmentmentioning

confidence: 99%

What Is Polluting Delhi’s Air? A Review from 1990 to 2022

Guttikunda

Dammalapati²,

Pradhan³

et al. 2023

Sustainability

Self Cite

View full text Add to dashboard Cite

show abstract

“…), the ambient ozone levels in the air have not decreased in the past decade. 22,23 Many studies suggest that O 3 has a detrimental effect on lung function and affects the mucous and respiratory tissues of living beings. 24,25 Moreover, prolonged exposure to O 3 has been linked to bronchitis, asthma, emphysema, heart failure, and other cardiopulmonary issues.…”

Section: Introductionmentioning

confidence: 99%