The court said the order by Mayor Philippe Laurent, mayor of Sceaux in the Hauts-de-Seine département on the outskirts of Paris, “was not justified by any local circumstances, and seriously violates fundamental freedom of movement”, said Patrice Spinosi of the League of Human Rights (LDH) group that had filed a complaint.
“Restricting rights and freedoms to ensure public health can only be ordered by a government,” Spinosi added.
Interior Minister Christophe Castaner said mayors should not be issuing unilateral orders to wear masks, adding it was a “thorny subject” and “not medically proven”.
Many workers in constant contact with the public are already wearing masks, like these boulangerie employees in Cannes. Photo: AFP
Laurent had ordered residents over the age of 10 to wear mask outside starting on Wednesday.
Mayors of several other towns have also said they are considering making masks compulsory in the coming days.
The mayor of Nice, Christian Estrosi, has said that masks would be obligatory in the Mediterranean coastal city after France's nationwide lockdown ends.
Debate has raged in France over whether masks help slow the spread of the virus.
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The government initially said that was not necessary for the general public – with shortages in hospitals where they were genuinely needed – but later shifted its position to say they could be useful.
The World Health Organisation's advice is still that only healthcare workers and those who already have the virus need to wear a mask.
Masks do not prevent people from getting the virus, but they can stop already infected people spreading it. As more evidence emerges of the number of asymptomatic patients, some authorities have moved to promoting masks as a way to stop the spread.
France's Director General of Health Jérôme Salomon said on Friday: “We encourage the general public, if they so wish, to wear (…) these alternative masks which are being produced.”
Compulsory masks is just one of a rash of new local regulations that have been introduced by local authorities and town mayors on top of the government's already strict lockdown measures.
Residents in some areas are banned from doing DIY during the day, spitting, renting a property for less than 14 days or jogging in the daytime.
While local mayors in France do have quite a lot of power, it is not unlimited.
Some local measures have have been withdrawn after protests include a ban on alcohol sales, a ban on sitting on a bench and a ban on going further than 10m from your home.