PRTRs in North America comprise: the US Toxics Release Inventory (TRI); the Canadian National Pollutant Release Inventory (NPRI); and Mexico’s Registro de Emisiones y Transferencia de Contaminantes (RETC).
Each of the North American PRTRs has been developed to meet national needs and each has a unique set of pollutants and sectors subject to reporting, with reporting thresholds that differ somewhat from those of the other two countries.
The updated action plan discusses in part: the status of North American PRTR comparability; differences in the industrial sectors and activities subject to reporting; and recommendations for enhancing comparability.
Canadian Water and Wastewater Association