There is a "shelter in place" order in an area within a two-mile radius of 63rd and Monarch in Boulder County. Do not go outside. There was a hazardous materials spill.
I'd never heard of such a thing as a shelter in place order, but they make lots of sense for a crisis like this one. I'd also consider closing windows and doors, and turning off the fans in ventillation systems that bring air in from outside.