California Code, Government Code - GOV § 7924.510

(a) Any information, analysis, plan, or specification that discloses the nature, extent, quantity, or degree of an air contaminant or other pollution that any article, machine, equipment, or other contrivance will produce, which any air pollution control district or air quality management district, or any other state or local agency or district, requires any applicant to provide before the applicant builds, erects, alters, replaces, operates, sells, rents, or uses the article, machine, equipment, or other contrivance, is a public record.

(b) All air or other pollution monitoring data, including data compiled from a stationary source, are public records.

(c) Except as otherwise provided in subdivision (d) and Chapter 3 (commencing with Section 99150) of Part 65 of Division 14 of Title 3 of the Education Code, a trade secret is not a public record under this section or Section 7924.700.

(d) Notwithstanding any other provision of law, all air pollution emission data, including those emission data that constitute trade secrets as defined in subdivision (f), are public records.  Data used to calculate emission data are not emission data for the purposes of this subdivision and data that constitute trade secrets and that are used to calculate emission data are not public records.

(e) Data used to calculate the costs of obtaining emissions offsets are not public records.  At the time that an air pollution control district or air quality management district issues a permit to construct to an applicant who is required to obtain offsets pursuant to district rules and regulations, data obtained from the applicant consisting of the year the offset transaction occurred, the amount of offsets purchased, by pollutant, and the total cost, by pollutant, of the offsets purchased is a public record.  If an application is denied, the data shall not be a public record.

(f) As used in this section, “trade secret” may include, but is not limited to, any formula, plan, pattern, process, tool, mechanism, compound, procedure, production data, or compilation of information that satisfies all of the following requirements: