ASPEN, Colo. (AP) _ The City Council has passed an ordinance that requires businesses either to ban smoking in public places or provide separately ventilated rooms for smokers.

The provision will probably force most restaurants to ban smoking entirely, officials said.

The ordinance, approved Monday night, should boost tourism in the ski resort city, said Sharon Mollica of Aspen, who proposed the law five months ago.

She said she knew of no tougher anti-smoking law in the country. Some other cities require public places to have smoking and non-smoking sections.

The measure applies anywhere the public is invited, including retail stores, public restrooms, hospitals, theaters and elevators, but not bars. It will be phased in to take effect June 1, 1986.