Wildfires have offset nearly four years of ozone-control progress nationwide, with larger setbacks in the West and Midwest.

HEATWAVES ARE not just a direct threat to human health, they also drive up concentrations of ground-level ozone that sharply ...

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 ...

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 ...

Located kilometres above the Earth’s surface, the ozone layer protects humanity and all life from the sun’s harmful ultraviolet rays. But in the troposphere, at ground level, this gas can wreak havoc ...

Ozone is an invisible, odorless gas that can either protect us or harm us depending on where it is found. Since at least the 1950’s the United States has been monitoring and regulating the amount of ...