Tuesday, 17th May 2005 by Alex Turnbull
The Inco Superstack is the tallest chimney in the Western hemisphere. Wikipedia says:
The Superstack sits atop the largest nickel smelting operation in the world at Inco’s Copper Cliff processing facility in the city of Greater Sudbury. It was constructed by Inco Limited in 1972 at an estimated cost of 25 million dollars. The 1,257 foot (381 m) structure was built to disperse sulphur gases and other by-products of the smelting process away from the city itself. As a result, these gases can be detected in the atmosphere around Greater Sudbury in a 150 mile radius of the Inco plant.
150 miles doesn’t seem all that surprising when you see the vast plume of fumes extending Northwards.