Lake Tahoe North Shore Area )) if ^ Sacramento Area Reno Area Stockton Area Modesto Area San Francisco- Oakland- San Jose Area N 0 50 100 Miles Fresno Area I 1 1 1 I 1 0 50 100 Kilometers EVADAf DESIGNATIONS IN US EPA REGION 9 :OR THE 1971 CARBON MONOXIDE (CO) NATIONAL AMBIENT AIR QUALITY STANDARDS (NAAQS) I I Attainment (Maintenance area) Unclassifiable/ Attainment County boundary State boundary or coastline ¦ ] Lake Tahoe Nevada Area sSO \ Lake Tahoe South Shore Area Las Vegas Area H A WA I I The 1971 primary NAAQS for CO with an 8-hour averaging time is 9 parts per million (ppm), not to be exceeded more than once a year. The NAAQS for CO with a 1-hour averaging time is 35 ppm, not to be exceeded more than once per year. Currently there are no areas in Region 9 that violate the CO NAAQS. Other US territories in the Pacific have been designated "Unclassifiable/Attainment". Sources: Title 40 CFR Part 81, §303, 305, 312, 329, 352, 353, 354, (2017), 58 FR 62133 (November 24, 1993), 63 FR 15305 (March 31, 1998), 70 FR 71776 (November 30, 2005), 73 FR 4420 (January 24, 2008), Teledyne (2012). AIR19040 - US EPA Region 9 carbon monoxide NAAQS designations.aprx (December 20, 2019) Bakersfi€ld Area ^ ^^L'os^ples -South Coast Air Ba§in,Area San Diego Area Tucson Area XI REGION 9 • AIR ------- |