Environment and Climate Change Canada says the haze in the air presents a moderate risk to southern Manitoba.
Winnipeg will see a low air quality risk for Wednesday, while Brandon and area will see a moderate risk.
Fires burning in Alberta and Saskatchewan are contributing to the haze. Most of Alberta and Saskatchewan are currently at a high to extreme risk of fire due to drought.
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The haze is likely to stick around for a few days.
The forecasted highs for Winnipeg and Brandon is 28 C for Wednesday, with a UV index of 7 or high.