A hiker enjoys the tranquility of McAlester Lake in North Cascades National Park, Washington.
National Park Service areas include deserts, mountain lakes, sandy beaches, and dense forests. They are home to pumas, song birds, fish, and coyotes; quaking aspen, saguaro cacti, azaleas, and rare lichen. But, even these protected areas and the species that live in them can be affected by air pollution.
Learn more about how air pollution affects nature:
