Hot and humid weather, combined with high levels of air pollution, has led to Southwestern Ontario’s first smog alert of the year.
Environment Canada has issued a special statement that people with asthma or other breathing problems may need to be cautious Tuesday because of deteriorating air quality.
The statement takes in the areas of Lambton County, Chatham-Kent, Essex County and Windsor, and the counties of Grey, Bruce, Huron and Perth.
Environment Canada says hot and sunny conditions are expected to cause increasing ground-level ozone concentrations Tuesday afternoon.
The index of air quality at airqualityontario.com shows that some areas rank a seven out of 10, or a “high risk” of problems among people with pre-existing health issues. It asks members of the general public to “consider reducing or rescheduling strenuous activities outdoors if [they] experience symptoms such as coughing and throat irritation.”