There have been multiple threads on the smoke/air quality, so I wanted to have one central thread to avoid posting in multiple locations.
A little FAQ
There are forest fires burning in BC, AB and the Northwest Territories. The smoke from these fires is presenting issues in BC, AB, SK and MB. Most of the smoke is coming from those fires in BC and NWT, not the fire in Banff National Park/provincial land (Spreading Lake Fire).
These fires are likely to be an issue for the rest of the summer, but no one can predict the intensity of the fires or the long term air quality issues. These vary considerably between locations, and will depend on weather, intensity/control of the fires, wind etc.
The fire at Spreading Creek (Banff NP) is being held. As the area has been long overdue for a natural fire, they are allowing it to burn to use up fuel sources while ensuring that it does not cross roads or threaten buildings.
At the moment, delays or closures of the Icefields Parkway between Saskatchewan River Crossing and Waterfowl Lakes are possible betweeen 2pm and 7am. These delays/closures could last throughout the summer, so it is advised to plan your travel through this area prior to 2pm. Rt. 11 is open, but there is NO stopping along this stretch of road and it is probably best to purchase fuel and supplies other than at Saskatchewan River Crossing.
At the moment, air quality varies widely by location and by day. It is not suggested that you make any changes to your travel plans unless you or someone in your party has serious respiratory issues. Lots of posters have been out hiking, scrambling and climbing, and report haze, but still good views and sunny skies (or rain, depending on the day).
There are no air quality measuring stations in the parks. Parks Canada may release air quality advisories for the park as they feel appropriate. Data from all AQHI stations in the province can be seen here:
Excellent models of surface smoke, which can give you idea where it might be smokier or hazier can be found here: