TOLEDO, Ohio — The Toledo Metropolitan Area Council of Governments (TMACOG), as well as the city of Toledo, is warning the public of health risks that come with increased ground-level ozone in the ...

A modeling study shows that global warming will make it harder to reduce ground-level ozone, a respiratory irritant that is a key component of smog, by cutting greenhouse gas emissions. Global warming ...

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 ...

Getting your Trinity Audio player ready... Colorado has three years to lower ground-level ozone pollution to meet federal standards, and this summer’s hazy skies — caused by oil and gas drilling, ...

The Colorado River makes life possible in many Western cities and supports agriculture that sustains people throughout the country. Most of the river's water begins as snowmelt from the mountainous ...