Environment Canada and the Ontario Ministry of the Environment have issued a smog advisory for the city of Toronto and much of Ontario.

The weather agency is urging you to reduce air pollution by car pooling and taking other measures to reduce emissi.

There are also warnings that heavy outdoor exercise may cause respiratory symptoms such as coughing or shortness of breath.

People with heart or lung disease including asthma may experience a worsening of their condition.

Higher pollution levels are expected to persist through tomorrow.

(With files from the Canadian Press)