A list of substances included in Canada’s National Pollutant Release Inventory (NPRI). In general, NPRI chemicals can be reasonably expected to cause acute or chronic adverse human health effects, or adverse environmental effects. These chemicals all have thresholds, over which they can definitely cause harm to health and the environment. For this reason, their release is monitored by Canada’s environmental agencies. Some examples of the more than 300 NPRI chemicals include, asbestos, benzene and dioxin.