California Air Resources Board

Would have required the South Coast Air Quality Management District (SCAQMD) board to update Rule 1157 to improve air quality and increase data collection. The bill would have required permanent and temporary aggregate operations, by January 1, 2027, to install and maintain a fenceline monitoring system, maintain fencing above the height of open piles, limit open storage piles to 8 feet tall if the covered facility is within 500 feet of a sensitive receptor, and cease all activities if particulate matter of 10 microns or less (PM10) emissions reach threshold limit set by SCAQMD. The bill would have required, on and after July 1, 2027, that a covered facility with a demonstrated history of PM10 emissions at or above the threshold limit set by the SCAQMD and whose property line is within 500 feet of a sensitive receptor to fully enclose any existing open storage piles. Was amended to address health facilities.

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