Evolution of PM2.5 levels in Europe and the United States The following videos depict the evolution of PM2.5 levels from 1998-2015 in Europe and the United States. The same color scales are used for both videos. As shown, there are drastic improvements in air quality for the whole US, while air quality in Europe does not show much improvement and some areas, including Milan, worsen. Video Author: Christine Choirat Data Sources:…
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