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This research aims to analyze air quality changes in major Indian cities during and after the COVID-19 lockdown.

June 15, 2026Discover AtmosphereOpen Access

COVID-19 lockdown altered atmospheric pollutant dynamics across major Indian cities

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Descriptive analysis reveals significant air quality improvements during COVID-19 lockdown across urban areas, suggesting new management strategies.

This research aims to analyze air quality changes in major Indian cities during and after the COVID-19 lockdown.
Descriptive comparative analysis of air quality in Delhi, Mumbai, Chennai, Bengaluru, Indore, Kolkata, and Guwahati.
Utilized Central Pollution Control Board data to examine PM₂.₅, PM₁₀, NO₂, SO₂, CO, and O₃ concentrations across three phases: pre-lockdown, lockdown, and post-lockdown.
Assessment of atmospheric physical and chemical processes and their impact on air quality.
AQI fell by 17–53% during lockdown, with NO₂ reductions of 30–60%, PM₂.₅ reductions of 14–40%, PM₁₀ reductions of 33–47%, and CO reductions of 21–60%.
Post-lockdown, six cities sustained air quality improvements, while Chennai exceeded pre-lockdown pollution levels.
O₃ exhibited modest increases (1–17%) in several cities, indicating altered urban photochemical conditions.

Shandilya et al. (2026) studied this question.

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June 15, 2026Discover AtmosphereOpen Access

View Full Paper

Ask AI

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Authors

Descriptive analysis reveals significant air quality improvements during COVID-19 lockdown across urban areas, suggesting new management strategies.

This research aims to analyze air quality changes in major Indian cities during and after the COVID-19 lockdown.
Descriptive comparative analysis of air quality in Delhi, Mumbai, Chennai, Bengaluru, Indore, Kolkata, and Guwahati.
Utilized Central Pollution Control Board data to examine PM₂.₅, PM₁₀, NO₂, SO₂, CO, and O₃ concentrations across three phases: pre-lockdown, lockdown, and post-lockdown.
Assessment of atmospheric physical and chemical processes and their impact on air quality.
AQI fell by 17–53% during lockdown, with NO₂ reductions of 30–60%, PM₂.₅ reductions of 14–40%, PM₁₀ reductions of 33–47%, and CO reductions of 21–60%.
Post-lockdown, six cities sustained air quality improvements, while Chennai exceeded pre-lockdown pollution levels.
O₃ exhibited modest increases (1–17%) in several cities, indicating altered urban photochemical conditions.

Shandilya et al. (2026) studied this question.

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