HSC §43018.2: (a) The state board shall amend Sections 2449.

(a) The state board shall amend Sections 2449.1 and 2449.2 of Title 13 of the California Code of Regulations to do both of the following: (1) Modify the nitrogen oxides (NO x ) and particulate matter (PM) best available control technology requirements to allow a fleet to achieve its cumulative turnover and retrofit requirements for the years 2011 to 2013, inclusive, by completing 20 percent of its cumulative turnover and retrofit obligations in 2011, an additional 20 percent in 2012, and the balance in 2013. (2) (A) Modify the nitrogen oxides (NO x ) and particulate matter (PM) credit provisions to reflect vehicle retirements that reduce total fleet horsepower between March 1, 2006, and March 1, 2010, and reduced activity between July 1, 2007, and March 1, 2010. (B) “Reduced activity” for the purposes of this paragraph means the percentage reduction in the average annual hours of operation of the off-road fleet. That percentage shall be carried forward as a credit for nitrogen oxides (NO x ) and particulate matter (PM) to offset the annual percentage reductions required for 2010 and 2011. The credit shall not be used to meet any obligations beyond 2011. (b) The amendment of regulations required by this section is exempt from the Administrative Procedure Act (Chapter 3.5 (commencing with Section 11340) of Part 1 of Division 3 of Title 2 of the Government Code).