A Massive 96% of National Parks Suffer from Air Pollution | 33 Parks Are as Polluted as the 20 Largest Cities The effects of air pollution on the national parks are even more widespread and distressing than we thought. 33 of Americaโs most-visited national parks areย as pollutedย as the 20 largest cities, a recent reportย from the National Parks Conservation Association shows. Related: New Data: Air Pollution Impacts 92% of Worldโs Population A massive 96% of the 417 national parks are troubled by […] SnowBrains | June 10, 2019 0 Comments