After an exhausting period of research (well, five seconds anyway) I found this by entering "Inco Superstack" in Wikipedia:
"The Inco Superstack in Sudbury, Ontario, with a height of 380 m (1,234 ft), is the tallest chimney in Canada and the Western hemisphere, and the second tallest freestanding chimney in the world after the GRES-2 Power Station in Kazakhstan."
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it's 381 meters tall. just high enough to send the smog to other cities instead of our own.
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"The Inco Superstack in Sudbury, Ontario, with a height of 380 m (1,234 ft), is the tallest chimney in Canada and the Western hemisphere, and the second tallest freestanding chimney in the world after the GRES-2 Power Station in Kazakhstan."
http://en.wikipedia.org/wiki/Inco_Superstack