In total, 21 Dutch tourist attractions and amusement parks are to ban visitors from smoking while they queue up, Dutch media reported on Tuesday.

The list of locations where smoking will be discouraged outside includes Amsterdam’s Rijksmuseum, the Efteling amusement park and Emmen’s Wildlands zoo.

The aim is to protect young visitors from the damaging effects of smoke, the papers said. The ban will be introduced on April 1.

Smoking has already been banned in covered outdoor waiting areas at the 21 attractions.