Officials warned young children and those with respiratory illnesses to take precautions. For weeks, smoke from Canadian wildfires has been drifting across the border.

Smoke billowing from wildfires is leading to poor air quality and reducing visibility throughout Manitoba this weekend. Environment Canada issued a warning Saturday morning for much of Manitoba, including Winnipeg in the south,

The air quality index (AQI) is predicted to be above 100 in much of New York state on Saturday, and could reach 135. Alerts are also in place for parts of New England. The AQI measures the severity of pollution in the air and categorises health risks. The higher the number, the more unsafe the air is to breathe.