THE UPSIDE OF LOCKDOWNS
Air Gets Cleaner Around the Globe
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by Kimberly B. Whittle
round the world, the COVID-19 pandemic has changed the way millions of people live their dayto-day lives, but despite their dire consequences, government-mandated lockdowns have had an unintended positive consequence: cleaner air. In China, as major cities shuttered factories and reduced transportation earlier this year, experts found that carbon emissions dropped by about 100 million tons over a two-week period.
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Scientists at the Royal Belgian Institute for Space Aeronomy, in Brussels, are using satellite measurements of air quality to estimate the changes in nitrogen dioxide (NO2)—a pollutant emitted into the air when fossil fuels are burned—over the major epicenters of the outbreak. Their research shows that NO2 pollution over Chinese cities decreased by an average of 40 percent during the lockdown compared to the same period in 2019. Across the United Kingdom, the re-
duction in traffic and industry similarly impacted the climate. Within the first six weeks of lockdowns, in London, Birmingham, Bristol and Cardiff, NO2 and fine particulate pollutant levels dropped by a third to half, with large declines recorded in other cities. These are the two air pollutants that have the biggest health impacts on people, says James Lee, professor of atmospheric chemistry at the University of York and research fellow at the National Centre for Atmospheric Science. The U.S. has been part of these trends, as well. In Los Angeles, known for its smog, the air quality index improved by about 20 percent during March. According to Yifang Zhu, a professor at the University of California (UC) Los Angeles Fielding School of Public Health, during March, the region recorded the longest stretch of “good” air quality that it has experienced for 25 years. NASA has observed significant air quality improvements in other parts of the U.S., as well. Satellite data for March showed that the mid-Atlantic and Northeast regions had the lowest monthly atmospheric levels of NO2 that month since 2005. Data on NO2 from the Aura Ozone Monitoring Instrument over the Northeast in March indicated that levels of the pollutant in March of this
Sergey Nivens/Shutterstock.com
In China, as major cities shuttered factories and reduced transportation earlier this year, experts found that carbon emissions dropped by about 100 million tons over a two-week period.
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