Approval and Promulgation of Air Quality Implementation Plans; California; Determinations of Failure To Attain the One-Hour Ozone Standard

The EPA is taking final action to determine that three areas in California, previously designated nonattainment for the now-revoked one-hour ozone national ambient air quality standard (NAAQS), did not attain that standard by their applicable attainment dates: the Los Angeles-South Coast Air Basin Area ("South Coast"), the San Joaquin Valley Area ("San Joaquin Valley"), and the Southeast Desert Modified Air Quality Maintenance Area ("Southeast Desert"). These determinations are based on three years of quality-assured and certified ambient air quality monitoring data for the period preceding the applicable attainment deadline.