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2. Alberta Air Emissions Trends and Projections;Alberta Environment,2008
3. Capital Region Fine Particulate Matter Science Report. December 2014;Alberta Environment and Sustainable Resource Development (AESRD),2014
4. Number of Motorized Vehicles Registered in Alberta as of March 31 2010–2014;Alberta Transportation,2014
5. Number of Motorized Vehicles Registered in Alberta as of March 31 2008–2012;Alberta Transportation,2012