California Code, Health and Safety Code - HSC § 42301.17

(1) Removed all internal combustion engines used in the production of crops or the raising of fowl or animals, except an engine that is used to propel implements of husbandry, at the source and replaced them with engines that meet or exceed the most stringent standards adopted by the state board and the United States Environmental Protection Agency for new internal combustion engines.

(2) Reduced or mitigated emissions from all agricultural activities, including, but not limited to, tilling, discing, cultivation, the raising of livestock and fowl, and similar activities, to a level that the district determines does not cause, or contribute to, a violation of a state or federal ambient air standard, toxic air contaminant, or other air emission limitation.

(3) Reduced or mitigated all emissions from any farm equipment, underground petroleum fuel tanks, or other similar equipment used in agricultural activities to a level that the district determines does not cause or contribute to a violation of a state or federal ambient air standard, toxic air contaminant, or other air emission limitation.

(4) Complied with any other conditions required by state or federal law or district rule or regulation for the source.