Health chiefs say they 'continue to be concerned' at the number of cases of measles in the Swansea and Neath Port Talbot areas.
Nearly 200 people have been diagnosed since the outbreak started in November, with 20 new cases in the last week alone.
More than 30 schools and nurseries have been affected so far.
Public Health Wales says it is working closely with Abertawe Bro Morgannwg University Health Board to combat the outbreak.
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Local authorities said the move is necessary to "avert the growing number of deaths and increasing harm linked to psychoactive substances".
Sunny and bright spells for most of us this afternoon, feeling pleasantly warm.
North Wales Fire and Rescue Service say incidents of deliberate fires are more common during the school holidays.