If you notice a haze in the sky, that's because Toronto's weather is being impacted by wildfire smoke.
You're being told to "limit time outdoors" and keep your windows and doors closed because of poor air quality.
Environment Canada has issued special air quality statements for Toronto, the GTA and the rest of southern Ontario as wildfire smoke blows into the region.
It's forecast that the smoke from wildfires in parts of Canada will impact Toronto and the GTA on Thursday night and into the morning on Friday, June 6.
According to Environment Canada, the smoke is expected to lead to poor air quality and reduced visibility.
Since an increase in smoke levels can also cause health risks to increase, you're being told to "limit time outdoors."
"Consider reducing or rescheduling outdoor sports, activities and events," Environment Canada said in the alert.
If you have to be outdoors, Environment Canada recommends wearing a well-constructed, well-fitting respirator-type mask (like an N95 respirator) to help reduce your exposure to the fine particles in the smoke.
Toronto buildingds under a smoky sky.Tomás Keating | Narcity
Even if you're indoors, the wildfire smoke could still have an impact. So, you're also being told to keep windows and doors closed as much as you can.
You could experience mild and common symptoms like eye, nose and throat irritation, headaches or a mild cough because of wildfire smoke.
More serious symptoms are less common but include wheezing, chest pains or severe cough.
People aged 65 and older, pregnant people, infants and young children, people with an existing illness or chronic health condition, and people who work outdoors are more likely to be impacted by outdoor air pollution.
These people should reduce or reschedule strenuous outdoor activities on Thursday and Friday.
"Check in on others who are in your care or live nearby who may be more likely to be impacted by outdoor air pollution," Environment Canada noted in the alert.
Also, Environment Canada said you should seek immediate medical assistance if you think you're having a medical emergency.