The legislation has a number of requirements for ‘No smoking’ signs, some of which were already in place from 2007 and some which were introduced on 1 March 2021.
Mae gan y ddeddfwriaeth nifer o ofynion ar gyfer arwyddion 'Dim ysmygu' - rhai ohonynt sydd eisoes ar waith ers 2007 ac eraill a gafodd eu cyflwyno ar 1 Mawrth 2021.