Wednesday, July 23, 2014 12:59 pm
Officials: Williston fire burned chemicals; air OK
Williams County Emergency Manager Mike Hallesy says the fire at Red River Supply will need to be fully extinguished before investigators can determine what caused it.
He also said the half-mile voluntary evacuation zone that was cordoned off has been lifted since the fire is mostly out.
North Dakota Department of Health Air Quality Division director Terry O'Clair says air quality tests at the site showed levels "that would not raise concern."
Hallesy says the air quality in Williston was worse when smoke from Canadian wildfires passed over western North Dakota several weeks ago.
The fire began about midnight Monday and burned most of Tuesday.