Childhood asthma cases linked to NO2 pollution have fallen in richer countries, but risen in south Asia and sub-Saharan Africa.
Brian van der Brug/Los Angeles Times/Shutterstock
Swain and his colleagues looked at an area of the western US stretching from Washington in the north to California in the south, and extending as far east as Montana and New Mexico. They divided the area into 111-kilometre-wide squares. Using data they had previously gathered, supplemented by new satellite data, they looked for what they term extremes in the levels of both PM2.5 and ozone between 2001 and 2020.
The number of people affected increased too. On one day – 21 August 2020 – about 46 million people were exposed to peaks in both pollutants.
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