France has introduced major changes as coronavirus cases in the country continue to rise.
The latest update comes after the UK government confirmed travellers arriving from France will now be required to quarantine for 14 days.
This is due to a spike in the number of coronavirus cases in the country.
The government's list of countries and territories where Brits can travel to and not have to self-isolate is continually being updated while the coronavirus pandemic continues.
A rolling review system could see countries removed from the list at very short notice.
Following an increase in cases, France is now mandating the use of face coverings in all workplaces, from the Paris business district to factories in the provinces, as it tries to contain growing virus infections while avoiding shutting down the economy.
Tuesday's announcement by the Labour Ministry makes France one of relatively few countries in the world that is universally requiring workers to wear masks on the job.
PA reports the move came after France's daily infection count jumped past 3,000 over the weekend, for the first time since May, and as the number of virus patients in hospitals, intensive care units and nursing homes is starting to inch up again.
France currently has among the highest infection rates in Europe, and already requires masks in public indoor spaces such as restaurants and in many areas outdoors.
As of September 1, masks will also be required in all shared, enclosed work spaces, including open-plan or shared offices, corridors, meeting rooms, and changing rooms, according to the new government rules.
Face coverings can only be removed when someone is alone in an individual office.
Laurent Pietraszewski, secretary of state for worker health, said: "The latest scientific knowledge about the possible risk of transmission of the virus via aerosols leads us to adopt a general principle of the systematic wearing of masks in indoor, shared workspaces."
About a quarter of the 1,013 virus clusters that have emerged since France ended its strict virus lockdown in May were traced to workplaces, according to the national health agency.
Family holiday gatherings, dance parties and other summer events have also led to outbreaks, raising new concern in a country that has already seen more than 30,000 virus-related deaths.
Labour Minister Elisabeth Borne said the new measures are needed to ensure "the protection of workers' health and the continuity of our economic activity".
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She and Mr Pietraszewski met with unions on Tuesday before announcing the rules.
Unions have pushed for more virus protections, and workers at the Louvre Museum, Amazon France and other sites walked off the job earlier this year out of concern that their employers were not doing enough to protect them.
The requirements will come into effect on September 1, when workers around France come back from summer holidays, after details of how to impose and enforce them are worked out with unions and the High Council on Public Health.
Already France has seen scattered incidents of violence by people refusing to don masks, and the government sent riot police to the Marseille region on Tuesday to enforce new outdoor mask requirements at farmers' markets and several neighbourhoods.
The French government is also recommending – but not requiring – that employees work from home if they can, and advises that individual lodging be used for itinerant workers instead of collective housing.
Many governments encourage masks at work but don't require them everywhere.
Among the few countries that mandate them are India and the Philippines, but enforcement varies.