The combustion engines in gas-powered cars are pretty inefficient, because most of the energy they use — about 70 percent — ...

The Trump administration asked the Ninth Circuit to pause a case over California emissions waivers while EPA leadership reviews them.

Tailpipe Emissions: Man admits to having 'sex' with 1,000 cars We love cars. We even bathe, polish, and prune our autos, but we're quite sure we've never taken our obsession this far.

If the fuel travels into the hot exhaust pipes and gets the chance to meet the oxygen outside, it ignites in a burst of fire when it comes out of the tailpipe. This doesn't happen in your typical ...

During normal operation, the emissions from a car's tailpipe should be invisible. But what if they're not? Should you be worried if you notice what looks like smoke? What should you do?

He also signaled his intention to roll back tailpipe emission standards, which will worsen greenhouse gas emissions. He also ...

The Trump administration is moving to hit the brakes on New York City's 'first-in-the-nation' congestion pricing program as ...

Marina Henke: A few years ago, a group of scientists researching salmon die-offs in the Pacific Northwest found the culprit: ...