Smoke from forest fires in northeastern Ontario and Quebec is again moving into the Stouffville area, resulting in a recently released Special Air Quality Statement.
While conditions can fluctuate over the coming days, likelihood for sustained low air quality and poor visibility is high.
Wildfire smoke can be harmful to the health of anyone outside, even at low concentrations.
Residents with lung diseases like asthma are especially at risk, as are young children, older adults, and those with heart disease.
Stouffville and other regions in Southern Ontario may see improved conditions by Friday.