In parts of Northern California, background ozone levels already account for more than three-quarters of total ozone, leaving little room for local ozone production if stricter standards go into ...

This article was originally featured on KHN. A year after health officials issued a record number of alerts for high ozone levels on Colorado’s Front Range, federal and state officials are trying to ...

For a large part of the last two weeks, Steven Brown, an air quality chemist with the National Oceanic and Atmospheric Administration, has soared over Colorado’s Front Range in a slow-flying Twin ...

A year after health officials issued a record number of alerts for high ozone levels on Colorado’s Front Range, federal and state officials are trying to rein in the gas that can make outdoor ...

Getting your Trinity Audio player ready... By Jim Robbins, Kaiser Health News A year after health officials issued a record number of alerts for high ozone levels on Colorado’s Front Range, federal ...

Some health experts say current state and federal measures won’t lower ozone pollution to safe levels across the state’s Front Range. A year after health officials issued a record number of alerts for ...

The cold winter months may bring temporary relief from Colorado’s long-running ozone pollution problem, but it’s crunch time for air quality planners and regulators hoping to finally clear the air ...

While ozone pollution is typically a summer phenomenon in Maricopa County, ozone season stretched well into the fall this year. High ozone levels usually drop off in mid-September, but Maricopa County ...

A year after health officials issued a record number of alerts for high ozone levels on Colorado’s Front Range, federal and state officials are trying to rein in the gas that can make outdoor ...

Colorado’s Front Range has seen little relief from ozone and wildfire smoke this summer. The dual pollutants have shrouded the region’s view of the Rocky Mountains and stirred a debate about the best ...

While Utah has made strides reducing particulate matter pollution over the Wasatch Front in recent years, local emissions reductions have had little impact on ozone levels, a less visible form of air ...