'Is it a killer cloud?' 1992 benzene leak blanketed and terrorized portions of Minnesota and Wisconsin - InForum | Fargo, Moorhead and West Fargo news, weather and sports
The chemical cocktail created an orange colored vapor cloud measuring 20 miles long and 5 miles wide — and it parked itself over the populated area of Superior, Wisconsin, and neighboring Duluth, Minnesota, prompting a mass evacuation of more than 50,000 people.
Source: duluthnewstribune.com