(1)    Except as provided in sub. (2), the department shall make any record, report or other information obtained in the administration of this chapter and s. 299.15 available to the public.

   (2)   The department shall keep confidential any part of a record, report or other information obtained in the administration of this chapter and s. 299.15, other than emission data or an air pollution control permit, upon a showing satisfactory to the department by any person that the part of a record, report or other information would, if made public, divulge a method or process that is entitled to protection as a trade secret, as defined in s. 134.90 (1) (c), of that person.

   (3)   Subsection (2) does not prevent the disclosure of any information to a representative of the department for the purpose of administering this chapter and s. 299.15 or to an officer, employee or authorized representative of the federal government for the purpose of administering the federal clean air act. When the department provides information that is confidential under sub. (2) to the federal government, the department shall also provide a copy of the application for confidential status.