The federal government has announced a proposed guidance for fine particulate matter (PM2.5) in residential indoor air quality.
The proposed guidance recommends that existing residential indoor air exposure limits for fine particulate matter as established by the 1987 Health Canada Exposure Guidelines for Residential Indoor Quality be rescinded as they are no longer supported by the available scientific evidence. No new numerical limits for indoor air are proposed. Rather, the proposed guidance recommends strategies to reduce exposure to indoor (PM2.5).
For more information see: http://www.gazette.gc.ca/rp-pr/p1/2011/2011-08-20/html/notice-avis-eng.html#d101