Mayors and political leaders across England have slotxo called for face masks to remain on public transport, despite coronavirus rules easing next week.
Almost all Covid-19 restrictions are set to be removed on 19 July.
Mayors including Greater Manchester's Andy Burnham and West Midlands' Andy Street have urged passengers to continue wearing face coverings.
London Mayor Sadiq Khan has declared masks mandatory on public transport in the capital.
But Mr Khan, unlike his counterparts across England, has the power to make it compulsory.
Mr Burnham said masks would still be required on Greater Manchester's Metrolink tram network as part of a condition of carriage.
He said he did not have power over buses or trains but urged people to continue wearing masks as an "act of solidarity".
He said he had been inundated with messages from vulnerable people describing 19 July as "fear day" rather than "freedom day", and it was "not right" that they should be "forced off" public transport.