On August 31, 2007, Ontario posted amendments to O. Regulation 419/05 Air Pollution - Local Air Quality, including 19 new or updated air standards for 14 air toxics, including lead.

The standards for these substances will be used to assess and manage local impacts from industries on surrounding neighbourhoods and communities. While some of these substances previously had guidelines, they are now to be regulated based on a legally enforceable health based standard. The substances chosen were selected based on their toxicity and the quantities being released in Ontario.

For a list of the substances and their proposed limits, and for more information, see:
 http://www.ene.gov.on.ca/en/news/2007/083101mb.php