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Air pollution control (31 - 40 of 80 items)

Environmental Protection Agency: Regional Haze Regulations
http://www.gao.gov/products/OGC-99-53

OGC-99-53: Published: Jul 8, 1999. Publicly Released: Jul 8, 1999.
Environmental Protection Issue Area: Active Assignments
http://www.gao.gov/products/AA-97-20(3)

AA-97-20(3): Published: Sep 1, 1997. Publicly Released: Sep 1, 1997.