Road salts are used as de- & anti-icing chemicals for winter road maintenance, and enter the Canadian environment through their storage & use and through disposal of snow cleared from roadways. This report summarizes the information critical to the assessment of these salts (including chlorides of sodium, calcium, potassium, & magnesium, as well as ferrocyanide salts added as anti-caking agents) as toxic. Information is included on their identity, properties, production, and sources; road salt loadings as determined from surveys; roadway snow disposal; releases of salts from patrol yards; environmental fate & pathways; and chloride concentrations in surface waters across Canada. The report concludes with an assessment under the Canadian Environmental Protection Act regarding toxicity & environmental impact of road salts on groundwater, aquatic ecosystems, soils, terrestrial vegetation, and terrestrial wildlife. A separate section characterizes the environmental exposure, effects, & risk of ferrocyanides.