The sign to look out for on face masks which show if they are effective

Business improvement company BSI said the scheme will assess face coverings to a technical specification requiring 70% particle filtration and "breathability" tests.

It will also provide "independent approval" of the quality of fitting and the instructions provided to a wearer on how to use the covering to reduce the chances of transmitting infection.

The announcement comes ahead of it being mandatory to wear face coverings in shops and supermarkets in England from July 24 to help tackle the spread of coronavirus.

By law they must also already be worn by passengers in England using public transport.

According to Government guidance, face coverings are not classified as personal protective equipment (PPE), such as surgical masks used in medical settings, but instead are largely intended to protect others from infection, not the wearer.

They can be bought in reusable or single-use form and people can use scarves, bandanas, religious garments or handmade cloth coverings, as long as they safely cover the nose and mouth and fit securely around the side of the face.

Howard Kerr, chief executive of BSI, said: "There is an overwhelming choice of face coverings available in the market.

"The challenge is knowing which claims they make are valid and whether they provide a basic level of protection to others.

"Face coverings that are independently assessed to schemes such as the Kitemark will allow consumers to make an informed and trusted decision."

Mr Kerr added: "As we continue to pull together as a country to combat the impact of Covid-19, it is important that we all take appropriate measures to protect one another.

"Whilst a face covering can never provide the same level of personal protection as a PPE or medical grade face mask, it is neither necessary nor appropriate for such products to be diverted to general consumer use.

"Providing consumers with confidence that their face covering provides some level of protection for those around them will help reduce the spread of the virus whilst we emerge from lockdown."

BSI said UK manufacturers Cookson and Clegg and Rototherm are among the first organisations in the final stages of assessment to achieve the new Kitemark.

It is expected that the first face coverings with the Kitemark will be available from late July.

Face coverings must already be worn in shops and on public transport in Scotland.

They are also compulsory on public transport in Northern Ireland.

In Wales, face coverings will only become mandatory for public transport when new rules come into force on July 27.