The Missouri Indoor Clean Air Act restricts smoking in enclosed public places, including public and private sector workplaces, to designated smoking areas (DSAs). The law applies to public restrooms; healthcare facilities; public transportation vehicles and school buses; public schools; childcare and daycare facilities during hours of operation; retail stores and other commercial establishment; restaurants seating 50 or more persons; and enclosed theaters and other places of entertainment (MO Rev. Stat. Sec. 191.765 et seq.).
Exceptions. Smoking regulations do not apply to stores where more than 50 percent of volume is from the sale of tobacco products and sundries; limousines and taxicabs if driver and all passengers agree to smoking; bars, taverns, and restaurants seating fewer than 50 people; an enclosed indoor sports arena that seats more than 15,000 people; and an entire private function room in which seating arrangements are under control of the function sponsor, not the building proprietor.
Smoking prohibited. The owner of a facility may prohibit smoking in the entire building; DSAs are not required under the Act. Signs indicating that smoking is not allowed must be posted conspicuously near entrances.
Entirely smoking permitted. Owners of bars and taverns (with less than 10 percent of gross sales from food), bowling alleys, billiard halls, and restaurants with less than 50 seats may declare the facility as entirely smoking-permitted. Signs stating "Nonsmoking Areas Are Unavailable" must be posted conspicuously at entrances. Designated Smoking Areas
No more than 30 percent of an entire space may be designated as a smoking area in any public place.
The person in control of a public place or public ...