A new study by Alberta health and the provincial energy regulator has been completed on air quality around the oilsands.
It found more than a dozen chemicals exceeding health and odour limits in the air in the northern Alberta aboriginal community of Fort McKay.
The community is surrounded by seven different oilsands mines.
The study says there is a chance that ongoing exposure may be affecting human health.
It calls for increased air monitoring and better responses to smell complaints.