01787nam 2200445 450 991069910780332120230902161642.0(CKB)5470000002400822(OCoLC)842363229(EXLCZ)99547000000240082220130510d2009 ua 0engurmn|||||||||txtrdacontentcrdamediacrrdacarrierParticulate matter urban-focused visibility assessment external review draftResearch Triangle Park, North Carolina :U.S. Environmental Protection Agency, Office of Air and Radiation, Office of Air Quality Planning and Standards, Health and Environmental Impacts Division, Ambient Standards Group,2009.1 online resource (156 pages in various pagings) illustrations (some color)Title from title screen (viewed on May 10, 2013)."September 2009.""DRAFT - Do not quote or cite.""EPA 452/P-09-005."Includes bibliographical references.Particulate matter urban-focused visibility assessment ParticlesEnvironmental aspectsUnited StatesVisibilityMeasurementUrban pollutionUnited StatesAir qualityStandardsUnited StatesParticlesEnvironmental aspectsVisibilityMeasurement.Urban pollutionAir qualityStandardsUnited States.Environmental Protection Agency.Ambient Standards Group,GPOGPOBOOK9910699107803321Particulate matter urban-focused visibility assessment3479691UNINA