A visual guide to air pollution in Ontario’s Chemical Valley – The Narwhal

July 2, 2025

See how high levels of benzene have been around Aamjiwnaang First Nation — and how much higher the province told industry they could go

There’s something in the air in Aamjiwnaang First Nation. The community is located next to an industrial area of Sarnia, Ont., known to many as Chemical Valley. There are dozens of factories and refineries here, accounting for 40 per cent of Canada’s chemical industry — and an enormous amount of air pollution.

That pollution comes in many forms, but the levels of one chemical in particular caused Aamjiwnaang to declare a state of emergency last spring. Benzene is a byproduct of petroleum refining, used to make Styrofoam and other plastic materials. It’s also a volatile organic compound — a category of chemicals that evaporate easily into the air. Inhaling very high amounts can make you very sick, very quickly. And constantly breathing benzene-laden air, even in very small amounts, can do a lot of damage, too — notably by increasing your risk of leukemia and other cancers.

Read More: https://thenarwhal.ca/sarnia-benzene-pollution-numbers/