Like the federal goverment, the state of California sets ambient air quality standards that local air districts like Yolo-Solano AQMD are required to meet. Of the 10 air pollutants for which there are state standards, Yolo-Solano meets eight. The District does not currently meet the state’s particulate pollution or ground-level ozone standards.
The California Clean Air Act requires district that do not meet the ozone standard to adopt an Air Quality Attainment Plan and to submit progress reports to the California Air Resources Board (ARB) every three years.
The original District plan was adopted in 1992. The Yolo-Solano AQMD Board of Directors adopted its 2015 Triennial Assessment and Plan Update on July 13, 2016. The report assesses air quality data from 2012-2014 and includes a list of control measures the District may take to ensure the state standard for ozone is reached.