Dossier
Front Range Urban Corridor
Coverage of Front Range Urban Corridor in the Nexus archive.
- Denver ranked most polluted global major city in U.S. as wildfire smoke, ozone cloud Front Range
Denver was ranked the most polluted major city in the U.S. due to wildfire smoke and elevated ozone levels. An ozone action day alert is in effect for Colorado's Front Range Urban Corridor, with health officials warning against outdoor activity. Seven major wildfires are burning in Colorado, contributing to the pollution.