People in Wales must wear face coverings on public transport - including taxis - from July 27.
The announcement was made by First Minister Mark Drakeford at the Welsh Government's daily press conference at 12.30pm on Monday. Follow live updates from that here.
He said: "It will become mandatory for people to wear a three-layer face covering while travelling [on public transport] – this includes taxis."
There Welsh Government has been under significant pressure to change its policy on face masks with many countries in Europe making them mandatory in public places very early in the crisis.
Scotland introduced mandatory face coverings on public transport on June 22 with exceptions only for children under five and people with certain medical conditions. In England, masks are mandatory on public transport and a formal review is underway on making masks compulsory in shops.
Mr Drakeford said: "For the sake of simplicity and consistency, as well as being part of our plan to help reduce the risk of transmission while on public transport where it is not always possible to maintain a 2m physical distance, it will become mandatory for people to wear a three-layer face covering while travelling – this includes taxis.
"The requirement to wear a face covering on public transport will come into effect from 27 July."
The First Minister said he was not making face coverings mandatory in other public places but this may change if there is a spike in cases.
"At this point in time, when the prevalence of coronavirus is low, we are not mandating the use of face coverings in other public places, but many people may choose to wear them," he said.
"Our advice may change if cases of coronavirus begin to increase and, where it is not possible for 2m to be maintained, some businesses may ask people to wear a face covering before they enter the premises.
The First Minister had previously been hesitant to introduce face coverings in Wales for a wide range of reasons including:
Mr Drakeford added: "I want to be clear that coronavirus has not gone away. Every day, we hear reports from around the world of countries, which have relaxed their guard – and their restrictions – only to see a resurgence of the virus and new lockdowns being put in place."
Follow live updates on our dedicated coronavirus blog.