Wisconsin Statutes Environmental Regulation (Ch. 280 to 299) § 285.85. Emergency procedure

(1) If the secretary finds that a generalized condition of air pollution exists and that it creates an emergency requiring immediate action to protect human health or safety, he or she shall order persons causing or contributing to the air pollution to reduce or discontinue immediately the emission of air contaminants, and such order shall fix a place and time, not later than 24 hours thereafter, for a hearing to be held before the department. Not more than 24 hours after the commencement of such hearing, and without adjournment thereof, the natural resources board shall affirm, modify or set aside the order of the secretary.

(2) In the absence of a generalized condition of air pollution of the type referred to in sub. (1), if the secretary finds that emissions from the operation of one or more air contaminant sources is causing imminent danger to human health or safety, he or she may order the persons responsible for the operations in question to reduce or discontinue emissions immediately, without regard to s. 285.83. In such event, the requirements for hearing and affirmance, modification or setting aside of orders set forth in sub. (1) shall apply.