Major air pollutants have declined in recent decades, but USA TODAY’s analysis shows wildfire smoke is taking their place.

"The reality is that things have gotten much worse since then," she said. "Absence of evidence is not evidence of absence." ...

Tesla has pocketed $11 billion from the sale of regulatory credits to rival automakers needing help to hit tough emissions ...

The LaSalle County Health Department is encouraging residents to test their homes for radon, a radioactive gas that occurs ...