Better traffic management and addressing gaps in public transport could be a start to fixing the problem, analysts say.

Gas-powered cars and diesel trucks remain the state’s largest sources of smog and soot despite decades of cutting emissions.

With 7 of its ambitious rules for cars, trucks and trains repealed, California officials must find new ways to clean up the ...

Dust and groundwater contaminated with heavy metals and radioactive chemicals pose a health threat that the authorities have ...

We’ve all heard that human overpopulation is a crisis. In 2017, Bill Nye warned us about the planet’s “people problem,” and ...