Air pollution: Locked down by COVID-19 but not arrested

COVID-19 lockdowns led to significant reductions in nitrogen dioxide (NO2) levels globally, but the impact on more harmful PM2.5 particulates was inconsistent and less pronounced. The author argues that air pollution acts as a risk multiplier for COVID-19 by increasing transmission, susceptibility, and severity. To prevent a return to high pollution levels during economic recovery, the document recommends green fiscal stimulus programs, citing the 2008 responses in the U.S. and South Korea as successful models for coupling economic growth with environmental improvement.

• Lockdowns in at least 89 countries caused a sharp global decline in nitrogen dioxide (NO2) concentrations, primarily due to the dramatic reduction in vehicular traffic.
• The reduction in PM2.5 particulates—the most harmful pollutants to human health—was not as consistent or stark as the decline in NO2, with some cities like Shanghai, Beijing, and Tianjin showing no difference during lockdown.
• Air pollution is identified as a risk multiplier for COVID-19, potentially increasing the virus's transmission by triggering coughing, increasing susceptibility by degrading cilia in the airways, and worsening severity for those with pre-existing chronic diseases.
• The U.S. government's 2008-2009 green fiscal stimulus for the auto sector, including US$80 billion in loans and the "Cash for Clunkers" program, resulted in a 61 percent fuel-efficiency improvement for traded cars and reduced annual gasoline use by 72 million gallons.
• South Korea's 2009 Green New Deal (GND), which included an initial investment plan of KRW 50 trillion (USD 38.5 billion), led to the renewable energy industry's sales growing 6.5 times and exports growing 7.2 times since 2007.

APA

Narain, U. (2020). Air pollution: Locked down by COVID-19 but not arrested. World Economic Forum. https://www.weforum.org/stories/nature-and-biodiversity/air-pollution-locked-down-by-covid-19-but-not-arrested/

Chicago

Narain, Urvashi. Air pollution: Locked down by COVID-19 but not arrested. World Economic Forum, 2020. https://www.weforum.org/stories/nature-and-biodiversity/air-pollution-locked-down-by-covid-19-but-not-arrested/.

Wikipedia

{{cite report |last1=Narain |first1=Urvashi |title=Air pollution: Locked down by COVID-19 but not arrested |publisher=World Economic Forum |date=19 August 2020 |url=https://www.weforum.org/stories/nature-and-biodiversity/air-pollution-locked-down-by-covid-19-but-not-arrested/ |access-date=23 October 2026 |via=Climate Insights Directory}}

BibTeX

@techreport{narain2020air, author = {Narain, Urvashi}, title = {{Air pollution: Locked down by COVID-19 but not arrested}}, institution = {World Economic Forum}, year = {2020}, month = aug, url = {https://www.weforum.org/stories/nature-and-biodiversity/air-pollution-locked-down-by-covid-19-but-not-arrested/}, urldate = {2026-10-23}, note = {Indexed by Climate Insights Directory} }