California Code, Health and Safety Code - HSC § 41706

(a) The Legislature hereby finds and declares that recent evidence indicates that lead compounds emitted into the air by nonvehicular sources accumulate in and upon vegetation in the vicinity of such sources, pose a grave threat to the health of animals which consume such vegetation, and constitute a potential human health hazard.

(b) Every district shall establish emission standards for lead compounds emitted into the air from nonvehicular sources. Where a district has failed to establish such standards, the state board shall establish such standards for that district.