Kilometers above the Earth’s surface, the ozone layer protects humanity and all life from the sun’s harmful ultraviolet rays.

Ground-level ozone is a major air pollutant that shortens human lives and kills thousands each year, resulting in major ...

"Just as ozone can be harmful at ground level but beneficial in the stratosphere, methane and other ozone precursors exhibit ...

"Just as ozone can be harmful at ground level but beneficial in the stratosphere, methane and other ozone precursors exhibit similar dual characteristics," Xie said. "Understanding these dual ...

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 ...

Fires and agricultural soils can rival cars and factories in emitting chemicals that lead to ozone, making it hard to meet air quality standards.