Air Pollution in National Parks as Bad as 20 Largest U.S. Cities

EcoWatch
By Olivia RosaneJul 19, 2018, 9:01 am101 pts
A new study shows the importance of clean air regulations to prevent air pollution from reaching national parks. A study published in Science Advances Wednesday found that, between 1990 and 2014, the ozone concentrations in 33 of the largest and most visited national parks were statistically indistinguishable…

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