Q-2, r. 4.1 - Clean Air Regulation

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173. A metallic surface treatment process must not emit contaminants into the atmosphere in excess of the limits prescribed as of the dates indicated and set out for each type of contaminant in the following table:

Contaminant Inorganic acid or Date of application
hexavalent chromium
emission limits
(mg/Rm3 of dry gas)

Inorganic acid 10 30 June 2011
other than
chromic acid

Hexavalent chromium 0.9 30 June 2011

0.03 4 January 2012

O.C. 501-2011, s. 173.