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All existing and new stone crusher units are required to comply with the prescribed pollution control measures under environment (protection) act . the details are as under- mandatory air pollution control measures parameter standards suspended the standards consist of.Apr 06, 21. fugitive emissions from stone quarrying, rock crushing, and screening operations shall not exceed: a. 12 percent opacity for crushers; and b. 7 percent opacity, at other affected emissions units. 22. truck dumping of nonmetallic minerals into any screening operation, feed hopper, or crusher is exempt from the emission limits in condition 21.