Canadian National Air Pollution Surveillance (NAPS) PM2.5 speciation program: Methodology and PM2.5 chemical composition for the years 2003–2008 - Dabek-Zlotorzynska, Ewa; Dann, Tom F.; Kalyani Martinelango, P.; Celo, Valbona; Brook, Jeffrey R.; Mathieu, David; Ding, Luyi; Austin, Claire C. (Atmospheric Environment, 2011)