<Li> San Luis Obispo , August 2 , 1990 , became the first city in the world to ban smoking in all public buildings . On January 15 , 2010 , the City 's municipal code amendment included city parks and outdoor recreational facilities as smoke - free areas . In April 2010 , City Council adopted an ordinance that bans smoking in all areas frequented by the public , with limited exceptions , including unenclosed areas at certain drinking establishments . </Li>
when did the smoking ban in public places start
August 2 , 1990