Smoke from a fire that started at a Waste Management transfer station in Englewood is to blame for poor air quality in metro Denver on Tuesday morning, officials say. The fire, which started Monday, involved two structures at 2400 W. Union Ave. One worker was treated by paramedics but does not have life-threatening injuries, Denver fire officials said on Twitter. The #DenverFireDepartment is working a fire that has involved two structures at 2400 W.