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

The ongoing effects of climate change have left much of the West to suffer from worsening air quality in recent years. But in places like California's San Joaquin Valley, home to productions of ...

Good morning, and welcome to the Essential California newsletter. It’s Thursday, April 20. California’s latest air quality report card has arrived, and it’s another one we’d be embarrassed ...

Amid the political spat between California and the Trump administration over environmental policy came a startling assertion this week from the U.S. EPA administrator: California, ground zero for c… ...

Powerful industries are pressuring California regulators to delay or roll back air quality and climate regulations due to the COVID-19 pandemic.

The Trump administration has revoked California’s unique authority to set its own standards for vehicle tailpipe emissions, a move the state is fighting in court. A historical analysis of air quality ...

The State of the Air 2022 report reveals the top and bottom cities for air quality; cities in the eastern USA are rated among the best.

While pandemic lockdowns helped improve air quality worldwide in 2020, the U.S. saw its air quality worsen — particularly on the West Coast — thanks largely to record-setting wildfires.

California's recent wildfires have caused an influx of smoke not only across the state but across the country. Following the recent string of wildfires, which began on November 8, the air quality ...