The National Park Service (NPS) Air Resources Division administers an Air Monitoring Program that measures air quality in national parks. The program communicates current air quality conditions and assesses long-term trends of air pollutants that affect parks' natural and scenic resources. The data are used to determine compliance with the National Ambient Air Quality Standards and to assess effectiveness of air pollution control policies.
The network of air monitoring stations participating in the program can be found in almost 70 national parks across the country. Several of these sites have been in operation for over 25 years. The program monitors three primary air quality measures: visibility, gaseous pollutants (mainly ozone), and atmospheric deposition (wet and dry). Meteorological monitoring is also conducted at many locations to aid in the interpretation of measured air pollution levels.
The map below shows the location and type of air quality monitoring happening in national parks. Additionally, the lists below provide links for ozone, visibility, and deposition monitoring information.