Northern Health and the environment ministry have issued a road dust advisory for Burns Lake.
Gravel left over from winter sanding activities is getting the blame for elevated pollution levels in the area.
People with chronic underlying medical conditions are being advised to postpone strenuous exercise near busy roads until the advisory is lifted.
Exposure to high levels of coarse particulates is a particular concern for infants, the elderly and those with diabetes, lung, or heart disease.
The road dust advisory is expected to stay in place until there is some precipitation or the gravel is collected from streets.