The incident happened at a business on Curé-Boivin Boulevard that manufactures foam insulation.
A cloud of smoke could be seen in the area and there were reports of a smell in the air.
Quebec environment ministry officials and firefighters were on the scene.
By 7 a.m., the City of Boisbriand said on its Twitter feed that the leak was non-toxic and didn’t pose a threat to residents.
The city said the situation is now under control.