Study Finds Grand Canyon Has Cleaner Air Than Other National Parks

Above, the Grand Canyon. Photo by Armand Vaquer.

A new study found that many of our national parks have unhealthy ozone levels, some more than others.

According to an article in AZCentral:

A new study from Iowa State University and Cornell University found national parks average 25 days per year with unhealthy ozone levels. 

Air pollution in national parks is as bad as some of the largest metro areas in the U.S. — though the Grand Canyon National Park is a breath of fresh air in comparison, according to a new study. 

On average, national parks spend about 25 days per year with unhealthy levels of ozone. This could cause a drop in visitors, especially when the parks and local communities publicly release health warnings, said Ivan Rudik, one of the study's co-authors. 

But there's good news for Arizona's natural wonder — the Grand Canyon only has nine of these days each year. Two years, it didn't have any.

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