The MBTA announced today that it is continuing to require masks on all T property, even above-ground stations and even if you claim you've been vaccinated. Sure, you won't risk a fine anymore by going barefaced, but you could still find yourself kicked off the T if you try to stand your ground or something with a T official or cop.
While the CDC and the Commonwealth’s guidance relax the need for face coverings in some settings, face coverings are still required while riding MBTA vehicles and within the MBTA system. This includes outdoor bus stops and all outdoor platforms for the Commuter Rail, subway, and trolley systems.
Effective April 30, 2021, civil fines related to MBTA face covering enforcement efforts are no longer in effect, though those who refuse to comply with the face covering requirement may be denied boarding of or be removed from MBTA vehicles and the system.
There continue to be exemptions to the face covering requirement for individuals with certain medical conditions and those who are so exempt do not need to produce documentation of their condition.