Air pollution is often called the 'invisible killer,' but these images make the invisible visible," Kirsty Pringle, a codirector of the project who is based at the University of Edinburgh, said in a press release.
The researchers created colored stripes for the capitals of each country, along with some other major cities and their universities' hometowns. Each image represents changes in air pollution from 1850 to 2021.
This kind of pollution - which might include dust, soot, and smoke - comes from smokestacks, tailpipes, and increasingly from wildfires made worse by climate change.
You can see stark contrasts from place to place, showing how much work is left to do to clean up pollution and also how well those efforts can pay off in the long run.
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