Air pollution is the biggest environmental threat to public health in the world today — even worse than water pollution, according to the 2018 Environmental Performance Index report. The report, which is released every two years, evaluates 180 countries’ performance on a number of environmental categories, ranging from conservation to pollution to public health. Each country is then assigned an EPI ranking — from best to worst.
Of note: The United States has the lowest EPI ranking of any Western country. On the opposite end of the spectrum, rapidly-industrializing India has sunk dramatically in the ranks, and is fourth from the bottom.