At the federal level, companies that emit more than a prescribed amount of listed pollutants must report annually to the
National Pollutant Release Inventory (NPRI) The National Pollutant Release Inventory (NPRI) is a national, legislated, publicly accessible inventory that provides Canadians with information about the releases and transfers of key pollutants in their communities. Created in 1992, it is maintained by Environment Canada under the authority of the Canadian Environmental Protection Act, 1999 (CEPA 1999).