Four California parks have been dubbed the most polluted parks in the nation in a new environmental study.

A report from the National Parks Conservation Association (NPCA) found that Sequoia and Kings Canyon National Parks ranked as the most polluted parks based on unhealthy levels of haze pollution along with the frequent threats of droughts and wildfires.

“With stunning mountains, caverns, forests, foothills and 2,000 plus-year-old sequoias towering overhead, the Land of Giants might seem invincible. In truth, these majestic parks, and the plants and wildlife which rely on them, face the unique and devastating consequences from human-caused air pollution and climate change,” the NPCA website described.

California’s Joshua Tree National Park, Mojave National Preserve, and Yosemite National Park all followed Sequoia and Kings Canyon as the top four.

Jennifer Wrenne left, and her boyfriend Mark Ruter, right, cleaning up Yosemite National Park in Yosemite, Calif. Hearst Newspapers via Getty Imag

Death Valley National Park, also in California, came in sixth.

“It’s not a surprise that air pollution is a problem in California. I think people know this,” Ulla Reeves, interim director for NPCA’s clean air program, told the Los Angeles Times.

“But we see that the sequoias and the Joshua trees and all of these places are really having an outsized experience of air pollution and climate threats.” 

Yosemite National Park was among the California parks listed on the NPCA’s Polluted Parks report. Anadolu Agency via Getty Images

The report concluded that climate change “is causing irreparable harm to our national parks” and offered policy solutions to combat it. 

“NPCA collaborates with communities and partner organizations to reduce air and climate pollution through the implementation of strong policies and regulations such as the Clean Air Act’s Regional Haze Rule, National Ambient Air Quality Standards and New Source Performance Standards for power plants as well as vehicle emission standards. We work to hold federal agencies, states and industrial polluters accountable for the air pollution driving climate change and harming visibility and nature in national parks and the health and wellbeing of people and communities,” the report read.

It continued, “Our work is aimed at making sure that national parks, park visitors, and nearby residents enjoy optimal air quality conditions, clear views, and healthy ecosystems.”

California’s Death Valley National Park was listed as the sixth most polluted park in the country. UCG/Universal Images Group via G

NPCA also found that 97% of US national parks “suffer from significant or unsatisfactory levels of harm from air pollution” with at least 57% of them suffering from “at least one high risk climate threat.”

While California cannot govern national parks, Rachel Norton, executive director of California State Parks Foundation, noted that the state can affect its parks’ budgets and allocate funds to address climate change.

“And if [the state] chooses to not invest, and not see these places as essential and critical to the success of our climate goals, then we might fail,” Norton told the LA Times.

“And that’s kind of unthinkable.”

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