Cal. Health & Safety Code § 42354

In prescribing other and different requirements, in accordance with Section 42353, the hearing board, insofar as is consonant with the Legislature’s declarations in Sections 39000 and 39001, shall exercise a wide discretion in weighing the equities involved and the advantages to the residents of the district from the reduction of air contaminants and the disadvantages to any otherwise lawful business, occupation, or activity involved, resulting from requiring compliance with such requirements.