Montana Clean Air Act Supplemental Poster

Montana Clean Indoor Air Act – No Smoking Poster

Help satisfy Montana smoke-free workplace signage requirements with the Montana Clean Indoor Air Act Poster. Montana law prohibits smoking in covered enclosed public places and workplaces and requires establishments to display conspicuous no-smoking signs at all public entrances.

Montana's Clean Indoor Air Act also prohibits electronic smoking devices, including e-cigarettes and vape pens, following the law's expansion in May 2025.

Poster Specifications

• Quantity: 1 poster
• Size: 11"W x 8.5"H
• Orientation: Landscape
• Language: English
• Format: Full-color Montana Clean Indoor Air Act notice
• Finish: Completely laminated with high-quality laminate
• Requirement: Montana Code Annotated §50-40-104

What Is the Montana Clean Indoor Air Act?

The Montana Clean Indoor Air Act (CIAA) protects employees and the public from secondhand smoke by prohibiting smoking in enclosed public places and workplaces, subject to specified exceptions.

Montana expanded the law in May 2025 to include electronic smoking devices. The prohibition now covers traditional smoking, marijuana smoking, and vaping in covered enclosed public places.

Who Must Display Montana No Smoking Signs?

Owners and managers of establishments containing enclosed public places must display conspicuous no-smoking signs at all public entrances.

Covered establishments can include:

• Restaurants and bars
• Retail stores
• Offices and workplaces
• Healthcare facilities
• Hotels and motels in covered areas
• Casinos and gaming establishments
• Public buildings
• Meeting rooms open to the public
• Auditoriums and entertainment facilities
• Public transportation facilities
• Educational facilities
• Other enclosed public places covered by Montana law

Does Montana Prohibit Vaping Indoors?

Yes. Montana Senate Bill 390 expanded the Clean Indoor Air Act effective May 8, 2025, to include electronic smoking devices.

The law now prohibits the use of covered devices, including:

• Electronic cigarettes
• Vape pens
• Electronic smoking devices containing nicotine
• Devices used to inhale marijuana or other substances
• Other electronic smoking devices covered by Montana law

Businesses must enforce applicable smoking and vaping restrictions in covered enclosed public places.

Does the Montana Clean Indoor Air Act Include Marijuana?

Yes. Montana's Clean Indoor Air Act prohibits smoking marijuana in covered enclosed public places and workplaces.

The legalization of recreational marijuana in Montana does not authorize smoking marijuana in locations where the Clean Indoor Air Act prohibits smoking.

Where Must Montana No Smoking Signs Be Displayed?

Montana Code Annotated §50-40-104 requires establishments containing enclosed public places to post signs in a conspicuous location at all public entrances.

The signage must clearly communicate that smoking inside the establishment is prohibited.

Businesses may display additional signs in employee areas, break rooms, customer service areas, or other locations to reinforce the smoke-free policy.

Are There Exceptions to Montana's Smoking Restrictions?

The Montana Clean Indoor Air Act provides limited exceptions, including certain private residences, private vehicles, qualifying designated hotel or motel smoking rooms, and specified cultural activities protected by law.

Businesses should review the applicable statutory requirements before determining whether an exception applies to their establishment.

Does Montana Require No Smoking Within 30 Feet?

No. Montana's statewide Clean Indoor Air Act does not establish a universal 30-foot outdoor smoking prohibition.

However, Montana public health officials recommend that businesses consider maintaining a 30-foot smoke-free area around buildings to reduce secondhand smoke exposure.

Local ordinances or individual property policies may establish additional outdoor smoking restrictions.

Can Montana Businesses Establish Stricter Smoking Policies?

Yes. Montana businesses and property owners may establish additional smoke-free or tobacco-free policies for areas under their control, subject to applicable law.

These policies may include restrictions on outdoor smoking, vaping, or other tobacco products beyond the minimum requirements of the Clean Indoor Air Act.

Is the Montana Clean Indoor Air Act Poster Required?

Yes, no-smoking entrance signage is required for establishments containing enclosed public places covered by Montana Code Annotated §50-40-104.

Montana law requires signs that clearly communicate the smoking prohibition. It does not require businesses to purchase a particular commercial poster design.

This Montana Clean Indoor Air Act Poster provides a convenient way to communicate the smoke-free establishment requirement.

Does This Poster Replace Other Montana Labor Law Posters?

No. The Montana Clean Indoor Air Act notice addresses smoking restrictions and is separate from employment notices concerning minimum wage, discrimination, workplace safety, unemployment insurance, and other labor laws.

Employers should maintain all applicable Montana and federal workplace postings in addition to required smoking restriction signage.

Montana Workplace Compliance Resources

Labor Law Compliance Center provides Montana employers with state and federal labor law posters, Clean Indoor Air Act notices, no-smoking signs, workplace safety materials, and specialty compliance products. Visit our Montana Labor Law Posters page or browse our Montana State Specialty Posters for additional Montana compliance products.