(a) The emergency proclamation may impose a curfew prohibiting in certain areas and during certain periods the appearance in public of anyone who is not a member of an exempted class. The proclamation shall specify the geographical area or areas and the period during each 24-hour day to which the curfew applies. The mayor may exempt from some or all of the curfew restrictions classes of people whose exemption the mayor finds necessary for the preservation of the public health, safety, and welfare. The proclamation shall state the exempted classes and the restrictions from which each is exempted.
(b) Unless otherwise specified in the proclamation, the curfew shall apply during the specified period each day until the mayor by proclamation removes the curfew.