Environment Canada has lifted the smog warning issued in Montreal.
Officials explained the level of particulate matter, large breathable particles that increase when air movement is stagnant, had climbed to “unacceptable” levels.
Environment Canada meteorologist Simon Legault told Global News there are “two things you need to have smog: the emissions of pollutants and very bad dissipation.”
He explained emission-filled warm air is being trapped beneath a layer of cold air and can’t escape.
David Blouin, who works near the intersection of Decarie Expressway and the Metropolitan, told Global News he struggles with smog every time the seasons change.
“For the last five or six years, like clockwork I’ll get sick,” he said.
“The air’s difficult to breathe.”
Although the agency noted most people won’t feel serious effects from the smog, it advised children, seniors and people with cardiac or respiratory conditions to stay indoors if possible.