The Smokefree Air Act requires businesses to post “no smoking” signs at every entrance that “clearly and conspicuously” inform persons that they are entering an area where smoking is prohibited, including entrances to outdoor serving and seating areas and in all vehicles owned, leased, or provided by an employer. Our Iowa You Are Entering A Smoke-Free Building Sign contains the telephone number for reporting complaints and the official website: www.IowaSmokefreeAir.gov.