Understanding air quality is a challenge. Air is mostly invisible and crosses National Park Service (NPS) boundaries affecting human health, visibility of park landscapes, and ecosystem health differently in different places. Knowing where air pollution comes from, what it is made of, and how it affects parks and park resources is key to protecting NPS areas. It is also important for the NPS to understand our legal responsibilities and tools for clean air in parks.
Last updated: January 17, 2018