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Montana Clean Indoor Air Act (CIAA)


What is the CIAA?


In 2005, the Montana legislature passed the Clean Indoor Air Act (CIAA), one of the most important public health policies in state history. Laws like the CIAA reduce heart attack rates by at least 20 percent. They also reduce lung disease, including lung cancer, as well as other debilitating and fatal illnesses, and they protect unborn children and young children from health problems.


The law requires all enclosed public places and workplaces to be smokefree and it requires businesses to prominently place smokefree signs on all public entrances. The Montana Department of Public Health and Human Services has adopted rules.


The health benefits of the law are three-fold:

  • Patrons and workers alike are protected from the deadly health effects of secondhand smoke exposure.

  • More people who smoke will try to quit.

  • Fewer Montana youth will begin smoking.


October 1, 2009, marked an important day for tobacco use prevention in Montana. Full implementation of the Montana Clean Indoor Air Act (CIAA) requires all enclosed public places and workplaces, including bars, taverns, and casinos, to be smokefree.


Laws like Montana's CIAA protect public health and prevent diseases caused by exposure to secondhand tobacco smoke. The significance of this major public health policy extends to future generations who will grow up healthy in a smokefree Montana. We encourage you to learn more about the CIAA by clicking here.


The majority of Montanans support the CIAA. This law belongs to Montana's citizens and we appreciate your continued support. You can help save lives by complying with the Montana Clean Indoor Air Act. If you observe a violation of the law in any enclosed public place or workplace in Montana, you can report it by completing a violation report form.






Information for Montana Businesses

 Resources to assist Montana businesses with complying with the CIAA.

Frequently Asked Questions




"This Establishment is Smoke Free" Signage
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