Polls routinely find that most Americans believe air pollution has been getting worse, will worsen in the future, and is still a serious threat to health. The reality is just the opposite: air pollution has been dropping for decades, will continue to do so, and has become a minor factor...

Air Quality in America rebuts mistaken perceptions that U.S. air quality is bad by documenting marked improvements over the past decades.

A plan to establish congestion pricing in New York City is not perfect, but it is much better than the status quo.

What can we make of a new study on the effects of climate change on future air pollution?

Most Americans still believe air pollution is a growing problem and a serious threat to their health. In reality, air quality in America's cities is better than ever.

Quick: How many kinds of gasoline do we use in America? Most people would say three or six: regular unleaded, mid-grade, and premium, along with the ethanol blends of the same that have become nearly universal. The actual number is somewhere above 45, though hard to pin down exactly, according...