Wearing a face mask in public has become mandatory across Paris and several surrounding areas, amid a surge in Covid-19 cases in France.
On Friday the country recorded 7,379 new infections - its highest number since early May.
The number of "red zones" where the virus is in active circulation has risen from two to 21.
Announcing new local curbs on Thursday, PM Jean Castex said he wanted to avoid another general lockdown.
He said the coronavirus was "gaining ground" across France, and that if the government did not act fast infection growth could become "exponential".
Despite a sharp rise in cases in recent weeks, daily death tolls have remained low. Overall, more than 30,500 people have died and almost 300,000 have been infected in France.
A number of European countries are seeing a surge in new cases, and Germany is also planning tighter rules.
Chancellor Angela Merkel warned on Friday that in the coming months things would become "even more difficult than now", as people have been able to enjoy life outdoors over the summer.