DENVER (AP) — Firefighters are still working to put out a fire at a metal recycling facility just north of downtown Denver.

The fire broke out Tuesday afternoon and sent up a large, black plume of smoke that could be seen for miles.

Adams County Fire Rescue said Wednesday that over 100 firefighters from over 15 fire departments have been rotating in and out to fight the fire and that the EPA is monitoring air quality.

The recycling plant is run by EVRAZ North America, which also owns the Pueblo steel mill. The company also has a recycling center in Colorado Springs.