You can't escape air pollution in national parks

The National Park Service mission statement breathes some grand words, as the conservation agency intends to preserve the country's natural resources "for the enjoyment, education, and inspiration of this and future generations."

But the Park Service can't keep out air pollution.

A new report published by the National Parks Conservation Association (NPCA) concluded that a whopping 85 percent of parks contend with unhealthy air. The problem is a respiratory toxin regularly created and found in U.S. cities, called ozone. The NPCA found ozone to be a "significant" concern in 87 parks, and a "moderate" issue in 267 parks.  Read more...

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from Mashable http://bit.ly/2E2FdH5