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 ...

Getting your Trinity Audio player ready... Colorado continues to fail to clean the dirty air that hangs over the northern Front Range, so state regulators plan to ask the Environmental Protection ...

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 ...

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 ...

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 ...

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 Oklahoma Department of Environmental Quality has issued an Ozone Alert for Wednesday, October 5, for the Tulsa metropolitan area. An ozone alert means that conditions are favorable for the buildup ...