HazMat situation prompts evacuation of Near North Side building

(Tripp/Flickr)
(Tripp/Flickr)

CHICAGO (Sun-Times Media Wire) - A hazardous materials situation prompted the evacuation of a Near North Side office building early Thursday afternoon.

The Chicago Fire Department responded to a Level One HazMat situation at 770 N. LaSalle, Fire Media Affairs tweeted at 12:14 p.m.

The carbon monoxide was initially measured at 200 ppm and the HazMat was elevated to a Level Two, according to Fire Media.

The building was evacuated, according to Fire Media. The source of the carbon monoxide was a gasoline-operated air-conditioning generator being used on the first floor of the building by a construction crew.

About 12:50 p.m., air quality returned to normal and crews were released from the scene.

CTA buses were also temporarily rerouted in the area.

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