Q-2, r. 4.1 - Clean Air Regulation

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13. Particle emissions from abrasive blast cleaning or scraping must be contained within an enclosed space, except in the case of a bridge or a metallic wharf being cleaned or scraped.
The same applies to cleaning or scraping with a wet blast system where particle emissions resulting from those operations are visible more than 2 m from the emission point.
O.C. 501-2011, s. 13.