The state board shall ensure that a district’s attainment plan and plan revisions meet the requirements of this part and of Part 3 (commencing with Section 40000), and that every reasonable action is taken to achieve the state ambient air quality standards for ozone, carbon monoxide, nitrogen dioxide, and sulfur dioxide at the earliest practicable date.
Source:
Section 41503.5, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=41503.5..