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Sequoia & Kings CanyonYosemite
Research Shows Damage

Studies have shown that summer ozone concentrations in these parks often exceed health standards and are among the highest in the nation; more than a third of the yellow pines in the parks show visible ozone injury, and giant sequoia seedlings and black oaks are at risk. 

The annual average visual range at park headquarters is only 47 miles, less than half of what it could be. 

Episodic acidification of high elevation lakes may be harming aquatic life. But as the saying goes, " The more we learn, the more we know we don't know." New questions constantly arise. For example, what effects do pesticides, ultraviolet radiation, and nitrogen deposition have on park resources? Studies are just beginning to answer some of these important questions.

Next Next - How Can We Protect the Parks? ...

Why Are The Parks Unique?

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  Giant Sequoia Trees


  Air Pollution: A Major Threat

  Research Shows Damage

  The Challenge

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