From June 15 face coverings have been required on public transport across the city.
Covering your face can help reduce the spread of coronavirus through communities, according to the World Health Organization.
British Transport Police have been fining people for non compliance with the face mask rules but some people are exempt from the requirements.
TfL officials will often remind passengers about the new rules at the entrance of stations.
But some people are exempt from wearing a facemask
This can be for a host of reasons including health issues, age, caring responsibilities and carrying out an official duty.
Those people who are exempt from the face mask requirement can download and print a TfL exemption card to be shown to officials if challenged.
If you need a card but are unable to print one, they are able to mail one to you.
Full list of people exempt
The following people do not have to wear a mask:
- Children under the age of 11
- TfL staff
- On duty police officers
- Emergency service personnel responding to an emergency
- People with a "good reason" not to
- A physical or mental illness or impairment, or a disability that means you cannot put on, wear or remove a face covering
- If wearing a face covering would cause you severe distress
- If you are travelling with or helping someone who relies on lip reading to communicate
- If you are travelling to avoid injury or escape the risk of harm, and you do not have a face covering with you
- If you need to remove it during your journey to avoid harm or injury or the risk of harm or injury to yourself or others
- If you need to eat, drink, or take medication you can remove your face covering
- If you are asked to remove your face covering by a police officer or other official, for example to check your railcard