The Mojave Desert Air Quality Management District (MDAQMD) is proposing the adoption of an updated 2015 8-Hour Reasonably Available Control Technology - State Implementation Plan Analysis (RACT SIP Analysis). Effective May 27, 2008, the United States Environmental Protection Agency's (USEPA) lowered the primary ozone National Ambient Air Quality Standard (NAAQS) from 0.084 parts per million (ppm) to 0.075 ppm. As a result, portions of the MDAQMD have been designated non-attainment for ozone and classified as Severe-15 for the new 8-hour ozone standard.

The shift to the lower NAAQS standard prompted the USEPA to require all non-attainment areas to submit an updated RACT SIP Analysis. The purpose of the updated RACT SIP Analysis is to ensure that the district rules adequately comprehend and detail the current effective RACT requirements. Therefore, the MDAQMD has assessed the district rules and all of its major sources of ozone precursors to ensure that the current rules satisfy RACT, as defined by USEPA.

It is important to note that this RACT SIP Analysis draws upon the 2006 RACT SIP Analysis, and the 2014 Supplement which were previously submitted to the USEPA for review. The current RACT SIP Analysis, therefore, provides a complete determination of the MDAQMD’s obligations. The MDAQMD has determined that the following rules will require amendments under this latest RACT SIP analysis: Rule 461, 462, 463, 464, 1104, 1106, 1114, 1115, 1118, 1157, 1158, 1160, 1161, and 1162.

For more information regarding the updates, click here.