California Air Resources Board

2025 Workshop

On Wednesday, October 1, 2025, the California Air Resources Board (CARB) held a public webinar on proposed updates to the area designations for State ambient air quality standards. During the webinar, staff presented background information on the State standards, the designation process, and proposed amendments to the area designations. These amendments reflect updates based on the annual review of the latest complete monitoring data (2022 to 2024). 

• Meeting Notice
• Presentation
• Presentation Text

2024 Amendments

CARB adopted updates to the area designations for State ambient air quality standards at a public meeting on January 23, 2025.  Information regarding these amendments can be found on the CARB regulatory webpage. These amendments have been approved by the Office of Administrative Law (OAL) on September 9, 2025, with an effective date of January 1, 2026.