Country Trends in Major Air Pollutants: Change in Carbon Monoxide (CO)

The Country Trends in Major Air Pollutants data set is part of the Air Quality for Health-Related Applications collection. This map represents country changes in Carbon Monoxide (CO) in parts per million (ppm), from the average CO for the years 2003, 2004, and 2005 to the average CO for the years 2016, 2017, and 2018.

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