Clean Air Act Reclassification; Nevada-Clark County Nonattainment Area; Carbon Monoxide

EPA proposes to find that the Clark County, Nevada carbon monoxide (CO) nonattainment area has met the criteria in section 186(b)(4) of the Clean Air Act (CAA): it exceeded the CO National Ambient Air Quality Standard (NAAQS) once in 1995; it has adopted and implemented the CAA required moderate nonattainment area control measures; and, it has demonstrated progress towards attaining the CO NAAQS. As a result of this finding, EPA proposes to grant a one-year extension of Clark County's moderate area attainment date from December 31, 1995 to December 31, 1996. EPA's proposed finding is based on a review of monitored air quality data for compliance with the CO NAAQS, as well as the air quality planning progress of Clark County. If EPA takes final action on this proposed finding, the Clark County CO nonattainment area will remain classified as a moderate CO nonattainment area as a result of extending the CAA mandated attainment date for one year. The intended effect of extending the attainment date is to allow Nevada and Clark County either to fully implement and strengthen current CO control measures, or to adopt additional control measures prior to the 1996-97 winter CO season in an effort to attain the CO NAAQS.