Q-2, r. 4.1 - Clean Air Regulation

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54. Fuel that has a sulphur content exceeding the following limits cannot be used in a stationary internal combustion engine:
(1)  1.5% (mass/mass) by weight for heavy fuel oil; or
(2)  0.5% (mass/mass) by weight for light fuel oil.
Despite the first paragraph, the operator of an existing stationary internal combustion engine may, until 30 June 2012, use heavy fuel oil that has a sulphur content exceeding 2% by weight.
O.C. 501-2011, s. 54.