{"data":{"id":"us/40-cfr-81.329","jurisdiction":"us","citation":"40 CFR 81.329","heading":"Nevada.","body":"Nevada—1971 Sulfur Dioxide NAAQS\n[Primary and Secondary]\nDesignated area Does not meet primary standards Does not meet secondary standards Cannot be classified Better than national standards\n(Township Range):\nSteptoe Valley (179) (10-29N, 61-67E):\nCentral X\nNorthern (area which is north of Township 21 North and within the drainage basin of the Steptoe Valley) X\nSouthern (area which is south of Township 15 North and within the drainage basin of the Steptoe Valley) X\nBoulder Flat (61) (31-37N, 45-51E):\nUpper Unit 61 X\nLower Unit 61 X\nRest of State 1 X\n1 Rest of State refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled Water Resources and Inter-basin Flows (September 1971), excluding the designated areas specifically listed in the table.\nNevada—2010 Sulfur Dioxide NAAQS\n[Primary]\nDesignated area 1 Designation\nDate 2 Type\nState of Nevada 3 Attainment/Unclassifiable.\n1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.\n2 This date is April 9, 2018, unless otherwise noted.\n3 Rest of State refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—Carbon Monoxide\nDesignated Area Designation Classification\nDate 1 Type Date 1 Type\nLake Tahoe Nevada Area\nHydrographic Area 90 Carson City County (part) Douglas County (part) Washoe County (part) 2/13/2004 Attainment\nLas Vegas Area: 9/27/2010 Attainment\nClark County (part)\nLas Vegas Valley\nHydrographic Area 212\nReno Area: Washoe County (part) Truckee Meadows Hydrographic Area 87 8/4/2008 Attainment\nRest of State Unclassifiable/Attainment\nCarson City County (part)\nArea outside Hydrographic Area 90\nChurchill County\nClark County (part)\nArea outside Las Vegas Valley Hydrographic Area 212\nDouglas County (part)\nArea outside Hydrographic Area 90\nElko County\nEsmeralda County\nEureka County\nHumboldt County\nLander County\nLincoln County\nLyon County\nMineral County\nNye County\nPershing County\nStorey County\nWashoe County (part)\nRemainder of county\nWhite Pine County\n1 This date is November 15, 1990, unless otherwise noted.\nNevada—Ozone (1-Hour Standard)3\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nReno Area:\nWashoe County (2) Nonattainment (2) Marginal.\nRest of State Unclassifiable/Attainment\nCarson City\nChurchill County\nClark County\nDouglas County\nElko County\nEsmeralda County\nEureka County\nHumboldt County\nLander County\nLincoln County\nLyon County\nMineral County\nNye County\nPershing County\nStorey County\nWhite Pine County\n1 This date is October 18, 2000, unless otherwise noted.\n2 This date is January 16, 2001.\n3 The 1-hour ozone standard is revoked effective June 15, 2005 for all areas in Nevada except the portion of Clark County designated nonattainment for the 8-hour ozone standard effective September 13, 2004 for which the 1-hour ozone standard is revoked effective September 13, 2005.\nNevada—PM-10\nDesignated area Designation Classification\nDate Type Date Type\nWashoe County:\nReno planning area 1/7/2016 Attainment\nHydrographic area 87\nClark County:\nLas Vegas planning area 11/5/2014 Attainment\nHydrographic area 212\nBoulder Flat (61) (31-37N, 45-51E):\nUpper Unit 61 11/15/1990 Unclassifiable\nLower Unit 61 11/15/1990 Unclassifiable\nRest of State 1 11/15/1990 Unclassifiable\n1 Rest of State refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled Water Resources and Inter-basin Flows (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and excluding the designated areas specifically listed in the table.\nNevada—1997 Annual PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate 1 Type Date Type\nStatewide 2 Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after January 5, 2005, unless otherwise noted.\n2 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—2012 Annual PM2.5 NAAQS\n[Primary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nStatewide 3 Unclassifiable/Attainment\n1 Includes areas of Indian country located in each county or area, except as otherwise specified.\n2 This date is April 15, 2015, unless otherwise noted.\n3 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—1997 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate 1 Type Date Type\nStatewide 2 Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after January 5, 2005, unless otherwise noted.\n2 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—2006 24-Hour PM2.5 NAAQS\n[Primary and Secondary]\nDesignated area Designation a Classification\nDate1 Type Date Type\nStatewide 2 Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 30 days after November 13, 2009, unless otherwise noted.\n2 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—NO2 (1971 Annual Standard)\nDesignated area Does not meet primary standards Cannot be classified or better than national standards\nBoulder Flat (61)(31-37N, 45-51E):\nUpper Unit 61 X\nLower Unit 61 X\nRest of State 1 X\n1 Rest of State refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled Water Resources and Inter-basin Flows (September 1971), excluding the designated areas specifically listed in the table.\nNevada—NO2 (2010 1-Hour Standard)\nDesignated area Designation a\nDate 1 Type\nState of Nevada 2 Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 This date is 90 days after October 31, 2011, unless otherwise noted.\n2 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—1997 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation a Category/classification\nDate 1 Type Date 1 Type\nLas Vegas, NV: Clark County (part) That portion of Clark County that lies in hydrographic areas 164A, 164B, 165, 166, 167, 212, 213, 214, 216, 217, and 218, but excluding the Moapa River Indian Reservation and the Fort Mohave Indian Reservationb 2/7/2013 Attainment\nRest of State Unclassifiable/Attainment\nCarson City\nChurchill County\nClark County\n(part) remainder\nDouglas County\nElko County\nEsmeralda County\nEureka County\nHumboldt County\nLander County\nLincoln County\nLyon County\nMineral County\nNye County\nPershing County\nStorey County\nWashoe County (Reno Area)\nWhite Pine County\na Includes Indian Country located in each county or area, except as otherwise specified.\nb The use of reservation boundaries for this designation is for purposes of CAA planning only and is not intended to be a federal determination of the exact boundaries of the reservations. Nor does the specific listing of the Tribes in this table confer, deny or withdraw Federal recognition of any of the Tribes listed or not listed.\n1 This date is June 15, 2004, unless otherwise noted.\n2 The effective date is September 13, 2004.\nNevada—2008 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area Designation Classification\nDate 1 Type Date 1 Type\nStatewide and Any Areas of Indian Country: 2 Unclassifiable/Attainment\n1 This date is July 20, 2012, unless otherwise noted.\n2 Statewide refers to hydrographic areas as shown on the State of Nevada Division of Water Resources' map titled “Water Resources and Inter-basin Flows” (September 1971), as revised to include a division of Carson Desert (area 101) into two areas, a smaller area 101 and area 101A, and a division of Boulder Flat (area 61) into an Upper Unit 61 and a Lower Unit 61. See also 67 FR 12474 (March 19, 2002).\nNevada—2015 8-Hour Ozone NAAQS\n[Primary and Secondary]\nDesignated area 1 Designation Classification\nDate 2 Type Date 2 Type\nLas Vegas, NV Nonattainment 1/21/2025 Serious.\nClark County (part):\nThat portion of Clark County that lies in hydrographic area 212.3\nLas Vegas Tribe of Paiute Indians of the Las Vegas Indian Colony.\nRest of State Attainment/Unclassifiable\nCarson City.\nChurchill County 1/16/2018\nClark County (part) remainder.\nDouglas County.\nElko County 1/16/2018\nEsmeralda County 1/16/2018\nEureka County 1/16/2018\nHumboldt County 1/16/2018\nLander County 1/16/2018\nLincoln County.\nLyon County 1/16/2018\nMineral County 1/16/2018\nNye County.\nPershing County 1/16/2018\nStorey County 1/16/2018\nWashoe County.\nWhite Pine County 1/16/2018\n1 Includes any Indian country in each county or area, unless otherwise specified. EPA is not determining the boundaries of any area of Indian country in this table, including any area of Indian country located in the larger designation area. The inclusion of any Indian country in the designation area is not a determination that the state has regulatory authority under the Clean Air Act for such Indian country.\n2 This date is August 3, 2018, unless otherwise noted.\n3 Hydrographic areas are shown on the State of Nevada Division of Water Resources' map titled Water Resources and Inter-basin Flows (September 1971).\nNevada—2008 Lead NAAQS\nDesignated area Designation for the 2008 NAAQS a\nDate 1 Type\nWhole State Unclassifiable/Attainment.\na Includes Indian Country located in each county or area, except as otherwise specified.\n1 December 31, 2011 unless otherwise noted.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 81—DESIGNATION OF AREAS FOR AIR QUALITY PLANNING PURPOSES","Subpart C—Section 107 Attainment Status Designations"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"49b70ce8af919f1e1ab49238e38bae04d904c2465972b6883705cc17a29f5a8b","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-81.328","next":"us/40-cfr-81.330"},"notice":"GroundRules: Original legal text. Not legal advice."}