There's a haze in the sky across a large portion of the Midwest. The smoke coming from more than 210 fires burning in Canada, according to the Canadian Interagency Forest Fire Center, on Friday, June 6.

Wildfires burning in Canada’s oil-producing region are prompting investors to examine the potential impact to midstream companies.

Poor air quality fuelled by wildfires burning across the Prairies left a large swath of the country enveloped in a haze again on Saturday, but Environment Canada said the situation is expected to improve over the weekend.