The Canadian Environmental Sustainability Indicators (CESI) program provides data and information to track Canada's performance on key environmental sustainability issues. The Releases of Harmful Substances to the Environment indicators track anthropogenic releases to air and water of three toxic substances: mercury, lead and cadmium and their compounds. For each toxic substance, emissions to air are provided at the national and regional (provincial and territorial) level and by source. Facility and global emissions to air are also provided for mercury. Releases to water for each toxic substance are provided at the national, regional (provincial and territorial) and facility level, and by source. Information is provided to Canadians in a number of formats including: static and interactive maps, charts and graphs, HTML and CSV data tables and downloadable reports. See supplementary documentation for data sources and details on how those data were collected and how the indicator was calculated.