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Two new studies show the unseen toll smoke is taking on people across the country. Climate change is likely to make the problem even bigger.
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Newly discovered damage to part of the dam holding back America's second-largest reservoir has people who rely on the Colorado River worried about their ability to get the water they need.
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We visit an orchard where researchers are breeding Chestnut trees they hope will one day fight off a fungus that's been killing the iconic American tree for more than a century.
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Half of the Great Salt Lake in Utah has now dried up but scientists say there's still some time left to reverse its decline.
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Akagera National Park in eastern Rwanda was hard hit by the violence of the country's genocide. For a time, the park floundered — but it's now flourishing.
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Japan is giving the U.S. 250 new cherry trees to help replace the hundreds that are being ripped out this summer as construction crews work to repair the seawall around the capital's Tidal Basin.
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Two years after the U.S. Forest Service accidentally ignited the biggest fire in New Mexico history nearly 2,500 victims are suing over slow aid payments.
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NPR's Ari Shapiro talks with Ali Zaidi, President Biden's national climate advisor, about the first ever national standards on the amount of PFAS in drinking water.
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Arizona Supreme Court allows a near-total abortion ban to take effect soon. EPA limits the amount of PFAS in drinking water. President Biden will welcome Japan's prime minister to the White House.
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PFAS chemicals have been used for decades to waterproof and stain-proof consumer products and are linked to health problems.
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The Environmental Protection Agency tightens standards for air pollution coming from more than 200 chemical plants in the U.S.
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A new EPA rule will force hundreds of chemical plants to limit emissions of two carcinogenic pollutants, ethylene oxide and chloroprene. The rule will affect factories in Texas and Louisiana.