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October 3, 2025Multidisciplinary Reviews

The effect of COVID-19 lockdowns on the air quality in major cities across the world: A review

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Authors

RVRussell Vela

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Overview

This review shows improved air quality by reducing key pollutants in major cities, indicating a need for sustainable control strategies.

Key Points

  • Lockdowns significantly reduced key pollutants like nitrogen dioxide and particulate matter in major cities, enhancing air quality.
  • Studies indicated that while emissions dropped due to the lockdowns, ground-level ozone levels paradoxically increased in various locations.
  • Meteorological factors such as temperature and wind direction played a crucial role in shaping air quality during the lockdown periods.
  • The temporary improvements in air quality during lockdowns were not sustained post-restrictions, underscoring the need for effective pollution control strategies.

Cite This Study

Russell Vela (2025) studied this question.

synapsesocial.com/papers/68e03501f0e39f13e7fa387fhttps://doi.org/10.31893/multirev.2026094
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