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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."
https://beta.theglobeandmail.com/ne...30151841/?ref=http://www.theglobeandmail.com&
"Your feelings on the pipeline aside, it's well-established among scientists that extraction of oil from these
oil sands (also known as tar sands) is environmentally dicey. The petroleum found in them doesn't flow easily like conventional crude—it's a sticky, viscous type formally known as bitumen but more commonly known as tar—so companies have to resort to alternate measures, either
surface mining (digging up the rock or sand covering the oil-laden sediment) or
injecting steam to get it out of the Earth.
This uses up an enormous amount of water, distributes toxic metals into the surrounding watershed and perhaps most important leads to an estimated 14 percent higher level of greenhouse gas emissions than conventional oil, because some natural gas must be burned simply to convert the bitumen into a usable form.
To this list of concerns, we can now add another.
A new study, published today in Proceedings of the National Academy of Sciences, shows that production in the Athabasca oil sands region is leading to the emission of levels of polycyclic aromatic hydrocarbons (PAHs) two to three orders of magnitude higher—that's one hundred to one thousand times greater—than previously thought. These higher levels of PAHs in the area aren't imminently dangerous (they're comparable to levels found in urban areas, which result from burning gasoline in cars and trucks), but they're significantly higher than reported in mining companies' environmental impact assessments and Canada's official National Pollutant Release Inventory."
http://www.smithsonianmag.com/scien...much-more-air-pollution-we-thought-180949565/