Cal. HSC § 44390

For purposes of this chapter, the following definitions apply: (a) “Airborne toxic risk reduction measure” or “ATRRM” means those in-plant changes in production processes or feedstocks that reduce or eliminate toxic air emissions subject to this part. ATRRM’s may include: (1) Feedstock modification. (2) Product reformulations. (3) Production system modifications. (4) System enclosure, emissions control, capture, or conversion. (5) Operational standards and practices modification. (b) Airborne toxic risk reduction measures do not include measures that will increase risk from exposure to the chemical in another media or that increase the risk to workers or consumers. (c) “Airborne toxic risk reduction audit and plan” or “audit and plan” means the audit and plan specified in Section 44392.