In Calgary, the air quality health index was at 4 on Friday. (Monty Kruger/CBC)The Alberta air quality index lists the health risks from low risk to extremely high risk. (Monty Kruger/CBC)The CBC's Monty Kruger captured some eerie images in southwest Calgary on Friday morning, and other Calgarians have been sharing their smoky images on social media. During "high" air quality readings of 7 to 10, people, especially children and the elderly, are advised to reduce or reschedule strenuous activities outdoors. A poor air quality risk can lead to throat irritation, headaches and difficulty breathing.

Source: CBC News September 19, 2020 01:05 UTC