Environment Canada issued a special air quality statement Saturday morning for the City of Calgary and a large swath of southern Alberta.
The areas impacted include Airdrie, Brooks, Cardston, Crowsnest Pass, Waterton Lakes National Park and Okotoks.
At noon on Saturday, Environment Canada's air quality health index rated Calgary as having a moderate health risk.
The weather agency said smoke from wildfires is drifting over the Rockies, causing poor air quality and reduced visibility.
"Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour," the agency said in its advisory at 9:16 a.m. on Saturday.
"Individuals may experience symptoms such as increased coughing, throat irritation, headaches or shortness of breath."
Children, seniors and those with cardiovascular or lung disease are considered to be especially at risk.
Health information on air quality can be found here.
According to the B.C. Wildfire Service, as of Saturday morning there are more than 190 active wildfires in B.C. with 60 of them burning in the southeast fire centre.
Environment Canada also issued special air quality statements for Jasper National Park and Hinton-Grand Cache due to smoke from a fire north of Jasper that is causing poor air quality and reduced visibility.