Consistent with standard Canadian practice, outdoor WTN SPLs were modeled at dwellings using the ISO 9613 standards (ISO, 1993, 1996). A simpler Swedish method (SEPA, 2012) was also used for comparison. The Swedish method included all turbines in the CNHS, and the ISO (1996) calculations were limited to wind turbines within a radius of 10km of dwellings.