Perhaps most disturbing is the counterproductive nature of the ads—the very idea that reducing poisons in our air is somehow unnecessary, even frivolous, because NAM says park air is clean. In fact, ...

In the Southeast, Mammoth Cave National Park was found to be the most haze-polluted national park in the country, according to our analysis. Great Smoky Mountains National Park ranked the third most ...

Data collected by the National Park Service show parks failed to meet U.S. air quality standards for ozone at least 85 times this year. In 2016, national parks exceeded the standard a combined 276 ...

At Sequoia National Park, about 200 miles (322 kilometers) north of Los Angeles, there have been more bad ozone days than in the city in all but two years since 1996, the study said. Park visitors ...

OAKLAND, Calif. (KTVU) - A new report found that the country’s 417 national parks, including the nine in California, are “plagued” by significant air pollution problems.

The report listed the 10 park lands most impacted by air pollution. The top three are Sequoia & Kings Canyon National Parks, Joshua Tree National Park and Mojave National Preserve — all in ...

At Sequoia National Park, about 200 miles (322 kilometers) north of Los Angeles, there have been more bad ozone days than in the city in all but two years since 1996, the study said.

A new national report on the health of the nation’s national parks found that 96 percent of are plagued by significant air pollution problems. In Rocky Mountains National Park, pollution issues ...

It based its findings on air pollution data collected by the National Park Service, the Environmental Protection Agency and academics. Highlighted in the 32-page analysis are the visible changes ...

At Sequoia National Park, about 200 miles (322 kilometers) north of Los Angeles, there have been more bad ozone days than in the city in all but two years since 1996, the study said.

Harmful nitrogen pollution is still drifting onto fragile, high-elevation ecosystems in Rocky Mountain National Park from Colorado highways, power plants and livestock operations, state and federal… ...