These clear signs inform the public that it is prohibited to smoke in areas where the signs are displayed. The signs are designed to indicate places where smoking is prohibited by law. They are also suitable for creating non-smoking zones in other places, for example for allergy reasons or to prevent the smell of smoke.

The signs meet the requirements for the European and international standard EN ISO 7010. The standard determines the design and colour of safety signs in workplaces and other locations where people need to be informed about safety matters. The purpose is to make the safety signs easy for everyone to recognise and understand no matter where they are or what language they speak.