35 Pa. Stat. § 4013.2
All records, reports or information obtained by the department or referred to at public hearings under the provisions of this act shall be available to the public, except that upon cause shown by any person that the records, reports or information, or a particular portion thereof, but not emission data, to which the department has access under the provisions of this act, if made public, would divulge production or sales figures or methods, processes or production unique to such person or would otherwise tend to affect adversely the competitive position of such person by revealing trade secrets, including intellectual property rights, the department shall consider such record, report or information, or particular portion thereof confidential in the administration of this act. The department shall implement this section consistent with sections 112(d) and 114(c) of the Clean Air Act. Nothing herein shall be construed to prevent disclosure of such report, record or information to Federal, State or local representatives as necessary for purposes of administration of any Federal, State or local air pollution control laws, or when relevant in any proceeding under this act.
35 P.S. § 4013.2