'High risk' air quality warning issued for Calgary as B.C. wildfire smoke returns
Environment Canada advises people with breathing difficulties to stay indoors
Smoke wafting over the mountains from the wildfires burning in British Columbia and the United States has prompted another air quality advisory from Environment Canada.
The air quality index in Calgary will hit 7 out of 10 on Thursday, which is considered "high risk," according to the federal agency.
Visibility will also be reduced.
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"Stay inside if you have breathing difficulties. Find an indoor place that's cool and ventilated," the agency said on its website.
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"If you open the windows you may let in more polluted air. If your home isn't air-conditioned, consider going to a public place."
According to Alberta Environment and Parks, the index is forecast to drop back down to 5 overnight and stay at 4 on Friday.
Air quality advisories also cover much of the central to southern part of the province, from Jasper down to Cardston and from Cypress Hills up to Lloydminster.
Smoke from the B.C. wildfires has triggered several air quality warnings in parts of Alberta from Environment Canada, Alberta Environment and Parks and Alberta Health over the summer.