School Bus Idling Airborne Toxic Control Measure

This page last reviewed Janurary 19, 2018


The California Air Resources Board (ARB) approved the Airborne Toxic Control Measure (ATCM) (Amended Regulation) limiting school bus idling and idling at or near schools to only when necessary for safety or operational concerns. It has been in effect since July 16, 2003. The program targets school buses, school pupil activity buses, youth buses, paratransit vehicles, transit buses, and heavy-duty commercial motor vehicles that operate at or near schools. In 2009, Senate Bill 124, Oropeza (SB 124) acknowledged and codified ARBs ATCM limiting school bus idling raising the minimum penalty for a violation of this rule from $100 to $300. The bill also clarifies local peace officer and air district authority to enforce the state's school bus idling program. SB 124 became effective on January 1, 2010, and the existing regulation was revised to reflect this change.

Please see the Historic webpage for the background information on the School Bus Idling ATCM.

Enforcement Information

Advisory 318: Limit on School Bus Idling

How do I Report an Idling Violation?

You can use any of the following options to report an idling violation:

  1. Call the Air Resources Board at 1-800-END-SMOG (1-800-363-7664)
  2. Submit an online complaint
  3. Contact your local air pollution control or air quality management district.

Contact Information

For more information regarding the ATCM to Limit School Bus Idling and Idling at Schools, please contact Michael Sekigahama at (916) 229-0514.

School Bus Idling List Serve - You can subscribe or unsubscribe to the ARB School Bus Idling ATCM List Serve created to notify interested parties about changes to this regulation.