This story originally appeared on Yale Environment 360 and is part of the Climate Desk collaboration. Sequoia National Park’s famous groves of stout, 300-foot-tall trees sit high on the western side ...

Ozone as a layer several kilometers up in the atmosphere protects living beings, including humans, from ultraviolet rays. But its accumulation at ground level can be very dangerous, Mongabay ...

Ground-level ozone is one of six major pollutants regulated nationally under the Clean Air Act. It is not directly emitted, but instead forms in the atmosphere through reactions between other ...