Masks and face coverings for added protection from the coronavirus

You must wear a mask indoors in public places, even if you are vaccinated.

Because of the Delta variant, we have more cases of COVID-19 right now. You are required to wear a mask to stop the spread of the Delta variant. You must wear a mask even if you are vaccinated.

You should still get vaccinated, because it's the best way to protect yourself from COVID-19, including the Delta variant. But wearing a mask offers an extra layer of protection and helps slow the spread.

We all need to wear face coverings indoors to protect others and to help healthcare workers.

San Francisco and 7 other Bay Area health officials have issued Health Orders requiring masks indoors in public places. Almost everyone must wear a mask from August 2nd.

When to wear a mask

You must now wear a mask in indoor public buildings even if you are fully vaccinated. 

Face coverings are still required when you are:

  • Seeking healthcare (including any waiting rooms)
  • Inside a K to 12 school, childcare facility, youth sports, or other youth setting
  • Jails
  • Homeless shelters, cooling centers and emergency shelters
  • Long term care facilities and adult and senior care centers


Face coverings are still required when you are:

  • On public transportation (or waiting for it indoors)
  • Driving or riding in a taxi or rideshare vehicle (even by yourself)

Scarves, ski masks, balaclavas, or bandanas are not allowed on any public transportation (or waiting for it). This is by CDC order. See SF guidance on traveling on public transit.


Certain groups are not required to wear a mask


Children under 2 years old must not wear face coverings. They might suffocate.

Children 2 to 9 years old must wear face coverings for in-person school,youth programs, and childcare programs. In other places, they must wear face coverings if they can. 

Children 10 and over must wear face coverings, like adults do in indoor public buildings.

Health and safety reasons

If you have a physical, intellectual, or developmental disability that prevents you from wearing a face covering, you do not have to wear one.

If you are deaf and use facial and mouth movements as part of communication, you can remove your mask while communicating.

Anyone who has trouble breathing, or is not able to take off a face covering without help, should not wear one. You do not have to wear a face covering if you have a letter from a medical professional saying you do not need to wear one because of your condition.

If you can’t wear a medical or fabric mask, use other options

You are still required to wear something over your nose and mouth to block droplets, such as a gaiter with 2 layers.

If you will create a safety hazard at work (under established health and safety guidelines) by wearing anything on your face, you do not have to wear one. 

If you have signed documentation showing a medical professional has told you not to wear a face covering of any kind, you do not have to wear one. The document does not need to explain your medical condition. The documentation should include the contact and license information of the medical professional.

The best mask for protection is one you wear consistently and correctly

When to double mask

Double masking is not always better than single masking, especially if you have a very high quality, effective single mask or N95 respirator. 

Double masking might be more protective than single masking, if:

  • The top mask helps the bottom mask fit more tightly on your face
  • You use 2 masks made from different materials (one mask may capture particles the other doesn’t)

Read more about how to make your mask fit better.

When to wear an N-95

Properly fitted N95 masks offer additional protection from the COVID-19 virus. It can filter particles better than other masks. 

But to keep you from getting COVID-19, the N-95 must fit tightly around your face. It will be harder to breathe in it. It’s also not designed for children. 

If you feel worse wearing an N95 mask, do not wear one.

If you are not vaccinated, consider wearing an N-95 when when you are:

  • At higher risk of severe illness if you get COVID-19
  • Indoors or outdoors close to unmasked people (like dining or personal services)
  • Indoors with lots of masked people (like grocery store clerks or bus drivers)
  • Going indoors where there are or were unmasked people (like janitors, hotel room service)

Read more about N95 use.

What not to use for COVID-19 prevention

A face covering can be made of cloth, fabric, or other breathable material, but it should not have holes. 

The following are not helpful for COVID-19 prevention:

  • Halloween or plastic masks
  • Ski masks with holes for the nose or mouth
  • Masks that have a one-way valve designed for easier breathing (often a raised plastic disk about the size of a quarter, on the front or side of the mask)

Holes or one-way valves allow droplets out of the mask, exposing people nearby. If you wear one, you should wear another face covering on top that doesn’t have valves.

Keep it clean

If you’re outside your home and your face covering gets wet, have another face covering ready to replace it.

Face coverings should be washed frequently. Ideally, wash them after each use in the warmest water possible and dry on the highest heat setting and leave in the dryer until completely dry.

Clean your hands before and after touching your face, or face coverings.

The CDC has instructions on how to wear and clean your face covering

Last updated September 02, 2021