Belching factory smokestacks and black smoke pouring from muscle-car tailpipes made the air unsafe to breathe in parts of the United States before legislation passed in the 1960s and the following ...

A new study confirms the Antarctic ozone layer is healing as a direct result of global efforts to reduce ozone-depleting substances. A new MIT-led study confirms that the Antarctic ozone layer is ...

In the stratosphere, ozone acts as a protective layer. But in the troposphere, at ground level, this colorless gas is incredibly harmful to human health and the environment in ways scientists are ...