For more information about National Park Service air resources,
please visit http://www.nature.nps.gov/air/. Air Pollution
Impacts Yosemite National Park Natural and scenic resources in
Yosemite National Park (NP) are susceptible to the harmful
effects of air pollution. Ozone, nitrogen, mercury, and fine
particles impact natural resources such as lakes, streams, fish,
and vegetation, and scenic resources such as visibility. Click
on the tabs below to learn more about air pollutants and their
impacts on natural and scenic resources at Yosemite NP. -
Nitrogen & Sulfur - Toxics & Mercury Ozone and Public Health
Concerns Ground-level ozone concentrations at the park are among
the highest recorded in national parks and sometimes exceed the
National Ambient Air Quality Standards set by the U.S.
Environmental Protection Agency to protect public health. Ozone
is a respiratory irritant, causing coughing, sinus inflammation,
chest pains, scratchy throat, lung damage and reduced immune
system functions. Children, the el