THUNDER BAY — Thunder Bay and other parts of Northwestern Ontario are under heat warnings as well as air quality advisories.
Environment Canada says temperatures into the lower 30s C combined with high humidity levels will raise Humidex levels to 36 C in the city on Monday.
Relief from the latest July heat wave will come Tuesday when a cold front drops temperatures back to normal levels.
"The next several days, temperatures will be more seasonal, with temperatures in the mid 20's," meteorologist Steven Flisfeder said.
However, smoke from more than 100 forest fires burning in Northwestern Ontario continues to impair air quality.
Environment Canada issued a special air quality statement noting that smoke plumes from active fires in the northwest as well as Manitoba are putting particles and gases into the air that can be harmful to human health.
People may experience symptoms such as increased coughing, throat irritation, headaches, or shortness of breath.
Children, seniors, and those with cardiovascular or lung disease are especially at risk.
The smoke is also causing poor visibility.
According to the Environment Canada statement, conditions may start to improve somewhat Monday evening as the cold front sweeps into the region and winds become more northeasterly.
Flisfeder said the smoke has travelled into southern Ontario and Quebec as well.
