Wildfire smoke in Manitoba could be even more toxic than usual and more research needs to be done on the pollutants being released into the air, according to scientists. 

The fires may be releasing pollution stored in the province's soil for millennia, including toxic chemicals from more than a century of resource exploitation in the north, said Colin McCarter, Canada Research Chair of Climate and Environmental Change.

Peatlands cover about one-third of the province and the boggy wetland is a cri…