Q-2, r. 4.1 - Clean Air Regulation

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12. Particle emissions from the transfer, fall or handling of materials including aggregates, ashes, grains, fertilizers, sawdust, wood chips, mine tailings, ore, ore concentrate, ore slag, coal, coke or iron concentrate pellets must not be visible more than 2 m from the emission point.
O.C. 501-2011, s. 12.