For example, if a school has a sports field that is for its sole use, but which is across the road from the school, the sports field will be smoke-free only when being used by the school.
Er enghraifft, os oes gan ysgol gae chwaraeon a ddefnyddir gan yr ysgol yn unig, ond os yw wedi’i leoli ar draws y lôn, dim ond pan gaiff y cae chwaraeon ei ddefnyddio gan yr ysgol y bydd yn ddi-fwg.