Q-2, r. 4.1 - Clean Air Regulation

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144. A cement plant kiln or clinker cooler must not emit particles into the atmosphere in excess of the limits respectively of 150 g and 125 g per ton of clinker produced.
Despite the first paragraph, a kiln and a clinker cooler in an existing cement plant may, until 30 June 2012, emit particles into the atmosphere beyond the limit values of 240 g and 150 g per ton of clinker produced.
O.C. 501-2011, s. 144.