Environment Canada is warning of poor air quality across southwestern Ontario due to the wildfires burning in the prairies, British Columbia and northern Ontario.
Hazy conditions were reported in the province on Thursday and continued into Friday.
The agency said northerly winds were expected to blow in Friday evening and it would improve the air quality.
Health risks
Symptoms include mild eye, nose and throat irritation, headaches or even a mild cough. In severe cases, people could experience wheezing, chest pains and a severe cough.
Those most affected by poor air quality are people aged 65 and older, pregnant people, infants, young children, people who work outdoors and anyone with an existing or chronic condition.
Residents are urged to check on their neighbours or loved ones who fall into these categories.
Anyone experiencing severe symptoms should seek immediate medical attention.
Reducing the impact
Residents are encouraged to limit their time outdoors and keep their windows and doors closed as much as possible.
A proper-fitting face mask, such as a NIOSH-certified N95 respirator, may be helpful for those who work outdoors.
At home, a good quality air filter or a certified portable air cleaner can help filter out some of the fine particles in the air.