Vast clouds of dense, toxic smog have once again ... that were once notorious for dirty air have managed to clean it up. The process took years, drawing on economic development and new technologies.

New research from UC San Diego scientists shows how Tijuana River pollution becomes airborne through sea spray.

Now researchers at Johns Hopkins University have developed a new method for measuring the cumulative effects on human health of multiple toxic air pollutants. Their findings were published last ...

By 2027, it will require companies to report even small amounts of 342 toxic air pollutants. These environmental moves are part of a larger goal to track air contaminants, identify the most ...

In the years since, exposure to the toxic air has sickened and killed thousands of people. Environmental epidemiologist Maayan Yitshak-Sade and former Stuyvesant High School student Lila Nordstrom ...