Dichloromethane could pose a threat to human health and the environment

In 1993, the Canadian government conducted its first assessment of dichloromethane and found that it could pose a threat to human health and the environment. A pollution prevention plan and a code of practice have been implemented to help reduce exposure to dichloromethane in the environment. To reduce the exposure of the general population to dichloromethane in Canada, risk management actions have been established through section 16 of the Food and Drug Act. One way Health Canada communicates this risk management action is by adding dichloromethane to the department's hot list of cosmetic ingredients.

Dichloromethane is primarily used as a solvent in paint and furniture stripping products, as a blowing agent in foam production, as an ingredient in aerosol products, and in other industrial process applications. Dichloromethane is not currently produced in Canada, but is imported from other countries.

Currently, the International Agency for Research on Cancer classifies methylene chloride as probably carcinogenic to humans. Non-cancer effects on the liver have also been associated with long-term exposure to methylene chloride in humans, while acute exposure from inhaling high concentrations of methylene chloride may cause serious effects on the central nervous system. Information collected by the Government of Canada shows that since risk management tools and actions took effect:

1. Long-term levels of dichloromethane in outdoor air remain below worrisome levels

2. Long-term levels of dichloromethane in indoor air remain below worrisome levels

3. Notice was received of three aerosol cosmetics containing methylene chloride, which have been discontinued for sale in Canada

Based on all available information, risk management actions taken by the Government of Canada have successfully reduced Canadians' exposure to methylene chloride through outdoor air and the use of aerosol cosmetics. More trend data on long-term indoor dichloromethane (dichloromethane sds) concentrations in Canada are needed to draw conclusions about the impact of risk management measures.

The assessment of the priority substances list did not take into account exposure to methylene chloride in occupational Settings and products containing methylene chloride available to consumers. Since such exposures have recently been recognized as a concern in other jurisdictions, and there is evidence that products containing methylene chloride are available to consumers in Canada, it is necessary to further describe the possible risks of these exposures to methylene chloride.