Q-2, r. 4.1 - Clean Air Regulation

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141.1. The operator of an aluminum smelter must measure annually the contaminants referred to in section 135 that are emitted into the atmosphere for potlines that are equipped with a scrubber and sampling station.
In the case of potline roof vents, the operator must measure the contaminants monthly.
O.C. 1131-2020, s. 3.