Tulsa’s buses are going half-price this summer as part of a strategy for cleaner air and healthier neighborhoods. From May 23 ...

Smog-check changes in the Golden State could be imminent thanks to the Senate Appropriations Committee’s “yes” vote.

“You can get a state ID (from California),” Chris Orrock, a DMV spokesman up in Sacramento, told Honk. “You can only have a ...

The Delhi government’s Environment Department plans to deploy GPS-enabled hydraulic anti-smog gun vehicles, equipped with ...

Produced primarily by the burning of fossil fuels, ammonium nitrate is a substantial portion of particulate pollution, a ...

Is the latest legislative effort to exempt classic cars from California’s emissions laws about to run out of gas? The answer ...