Air quality warnings were issued throughout parts of Alberta and Saskatchewan over the Labour Day long weekend as thick smoke hung over the provinces.

Environment Canada said a cold front caused wildfire smoke from the Northwest Territories to drift down across the Prairies, causing poor air quality and reduced visibility in central and northern Alberta.

The agency said several cities are expected to see an Air Quality Health Index (AQHI) of 10 or more throughout Monday and Tuesday, including Edmonton.

Edmonton extreme weather response

The City of Edmonton activated its extreme weather response for poor air quality on Sunday night.

The city said the response is activated when there is two days in a row with a score of seven or higher on the AQHI.

The response includes opening city

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