The air quality throughout most of Alberta has worsened and could remain high for some regions through mid-week, according to Environment Canada. All of southern and central Alberta, as well as northern parts of the province, have been issued a special air quality statement Sunday morning, as wildfire smoke continues to cause poor air quality and reduce visibility. The air quality health index is expected to reach 10 or higher in most affected regions Sunday and Monday, including Edmonton and Calgary, according to the weather agency. Air quality can vary hourly and over short distances. A health index rating of at least 7 is considered high-risk; 10 or higher is deemed very high risk.

Source: CBC News July 18, 2021 17:03 UTC