Sep 27, 2010 | News Room - News
Click here to view the updated table. The ozone standard set by the U.S. Environmental Protection Agency (EPA) is calculated using a rolling three-year average of the fourth (4th) maximum 8-hour ozone concentrations. An official violation occurs when the rolling...
Jul 20, 2010 | News Room - News
Click here to view the updated table. The ozone standard set by the U.S. Environmental Protection Agency (EPA) is calculated using a rolling three-year average of the fourth (4th) maximum 8-hour ozone concentrations. An official violation occurs when the rolling...
Aug 9, 2019 | News Room - News
The U.S. Environmental Protection Agency (EPA) is proposing to determine that the Denver Metro/North Front Range ozone nonattainment area did not meet the 2008 National Ambient Air Quality Standard (NAAQS) (i.e. 75 parts per billion (ppb)) by the specified deadline...
