DENVER (KDVR) — Boulder County officials were asking residents not to call 911 as wildfire smoke from Washington and Oregon drifted into the Front Range on Thursday night.

A large smoke plume made its way across the western U.S. on Thursday, increasing concentrations of particulate in the air starting in western Colorado and pushing into the northern Front Range urban corridor.

The region's hot, dry weather, combined with out-of-state wildfire smoke, means the area is inching towards the "unhealthy for sensitive groups" level of air quality. An "Action day" alert was issued Thursday through 4 p.m. Friday for the ozone and fine particulate.

"We anticipate both ozone and fine particulates to be elevated through this evening, so avoiding prolonged or heavy exertion is recommended through l

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