Rescission of Clean Data Determination and Call for Attainment Plan Revision for the Yuma, AZ 1987 PM10

Publication Date: 
Tuesday, June 1, 2021 - 4:00am

The Environmental Protection Agency (EPA) is proposing to rescind its previously issued clean data determination for the Yuma, Arizona ``Moderate'' nonattainment area for the 1987 24-hour national ambient air quality standard (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM<INF>10</INF>) because recent complete, quality-assured monitoring data show that the area has subsequently violated this NAAQS. We are also proposing to find that the Arizona State Implementation Plan (SIP) is substantially inadequate to attain or maintain the PM<INF>10</INF> standard and to call for Arizona to revise the SIP to address this inadequacy.

Environmental Protection Agency