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The ozone layer is a thin shield in the stratosphere that protects humans and the environment from harmful levels of the sun's ultraviolet radiation.
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The Trump administration seeks to roll back and delay dozens of regulations across government, including one to lower smog-creating ozone. Environmental groups are challenging the EPA in court.
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Lawsuits against the U.S. Environmental Protection Agency keep rolling out of Oklahoma Attorney General Scott Pruitt’s office. On Friday he took the first…
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The Obama Administration recently announced stricter limits on ground-level ozone, a smog-causing pollutant closely monitored by environmentalists and the…
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The Environmental Protection Agency's new rule sets reduces the threshold for the particles that contribute to smog at 70 parts per billion, lower than than 75 ppb currently on the books. NPR's Ari Shapiro learns more from reporters Joe Wertz in Oklahoma and Mose Buchele in Texas.