Globe and Mail: A cloud of noxious particles brewing in the air above the Alberta oil sands is one of the most prolific sources of air pollution in North America, often exceeding the total emissions from Canada's largest city, federal scientists have discovered.
The finding marks the first time researchers have quantified the role of oil-sands operations in generating secondary organic aerosols, a poorly understood class of pollutants that have been linked to a range of adverse health effects.
The aerosols...