Ozone

The hole stretches from Hudson Bay all the way to Russia's Arctic islands.

Findings come over 30 years after the Montreal Protocol was introduced.

If emissions of banned gases continue at their current rate, recovery could be delayed by up to 18 years in a worst-case scenario.

"The result is the United States gets dirtier air and we get to pay more money for the dirty energy being provided," Robert Ukeiley of the Center for Biological Diversity told Newsweek.

Scientists at the EU's Copernicus Atmosphere Monitoring Service who track the size of the ozone hole in the Antarctic reported that it is expected to be atypically small this year.

Scientists warned efforts to tackle air pollution that have saved the lives of Americans are under threat from Trump administration policies.

Has one of the "greatest environmental crime mysteries" in history been solved?

A Code Orange alert signals higher concentrations of air pollution—and potentially dangerous conditions.

The ozone is depleting over the most populous areas of the planet.

Between 25 and 41 percent of nitrogen oxide is emanating from agricultural lands in California.

Chlorine levels specifically have been declining since at least 2005.

The U.S. benefits from other countries working to curb greenhouse gases and improve air quality.

The hole was still two and half times the size of the U.S.

There's no gain in the U.S. participating in a treaty that combines bad science with bad economics.

Over 126 million Americans—about 40 percent—live in areas that fail to meet environmental standards.

Asteroids, solar flares and gamma rays... The universe is not short of ways to end life on Earth.

"Injecting" aerosol into the stratosphere could cool the planet and repair the ozone layer.