When and Why to Wear a Mask
The Benefits of Masking and Tips for Choosing the Right Mask
Wearing a high-quality mask that fits well and has good filtration helps to protect you. It helps to protect you from breathing in viruses, wildfire smoke, and other particles or germs in the air.
Respirators, such as N95s or KN95s are the best type of masks. They offer more protection because they generally have better fit and filtration. Surgical masks and cloth face coverings, have less filtration than respirator masks. You can buy N95 and KN95 respirators at drugstores, hardware supply stores, and online. ā
āWhen to Consider Wearing a Mask
If you believe you were exposed and will be in contact with someone who is high risk, consider wearing a high-quality mask.
If you are at high-risk of becoming severely ill, consider wearing a high-quality mask (respirator). For example when you are in an indoor public setting with poor ventilation, or when you areāÆtraveling on public transportation.
People who are at high risk for severe respiratory infections include:
Older adults, especially those 65 and older
People with certain chronic or medical conditions such as a heart disease or cancer
People with weakened immune systems
People who are pregnant or were recently pregnant
People with disabilities
People who are in a skilled nursing facility and otheār long term care facilities
Infants, especially those who are less than 6 months, and young children (less than 5 years)
Protection Against Harmful Environmental Exposures
Wildfire Smoke
When aāÆwildfire causes poor air qualityāÆin your area, wearing a fitted N95 respirator, that has been fitted correctly, can help filter out smoke. ā
Valley Fever
InāÆcertain areas of California, the fungus that causes Valley fever grows in the soil and may be in outdoor dust. When working or spending time outdoors in these dusty areas, wear a fitted respirator. Use a respirator to protect you from breathing in dust and fungal spores that can cause Valley fever. Learn more aboutāÆValley fever safety in the workplace and Valley fever prevention for the general public. ā
āChoosing the right maskā
āN95s N95 respirators offer the best protection. They provide the most efficient filtration. Adults should choose an N95 respirator that has been professionally fit tested, and approved by NIOSH. N95s have two head straps and a tight fit. Authentic NIāOSH-approvedāÆN95 respirators should have specific markings. Learn more about counterfeit (fake) respirator masks and how to use N95 respirators. ā
| āāKN95s
KN95s and KF94s are respirators that meet international standards. They provide good protection, butā less protection than N95s. Most KN95s and KF94s have ear loops, which may provide a less-snug fit than respirators with head straps such as N95s.
If you choose to use a KN95, use one that has been tested by NIOSH. That has at least "filtāration efficiency" of 95% or higher. These respirators are not approved NIOSH stanādards for use in the workplace when respirators are required.āā
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Fit
AāÆrespirator should fit snuglyāÆto your face. This includes covering both your nose and mouth, with no gaps between the mask and your skin. They should fit comfortably on the bridge of nose and snugly on chin to minimize gaps, based on manufacturerās instructions. If your respirator has any gaps, it will allow the flow of unfiltered air into your lungs. Also, any facial hair will prevent the respirator from working properly. Maintain a cleanāÆshaveāÆ(PDF), if possible.
Check for any gapsāāÆby cupping your hands around the outside edges of the respirator. Make sure no air is flowing from the area near your eyes or from the sides of the respirator. If the respirator has a good fit, you will feel warm air come through the front of āthe respirator only. You may be able to see the respirator mask's material move in and out with each breath.
Change your mask as needed. Do not wear a dirty mask. Throw away disposable masks or respirators that become wet or dirty.āā
āSurgical Masks
Surgical masks include various types of loose-fitāāting disposable masks. These masks can block large droplets but donāt fit close to the face. Even when worn tightly, surgical masks proviāde much less protection than a respirator. ā | āCloth MasksCloth masks are less protective than surgical masks or high-quality respirators. ā |
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āāāFor Chāildren
Masks canāÆbe worn safely by childrenāÆ2 years of age and older. There are rare exceptions. Children under age 2 should not wear a mask. Choose a mask for your child that has the best protection,āÆbest fit, and one your child will wear.
āMasks should fitāÆover the nose and under the chin with no gaps around the edges. They should not prevent your child from seeing. KN95sāā are available in āchildā or āextra-smallā sizes. N95s in size āsmallā may fit older children but may not fit younger or smaller children. There are noāÆNIOSH-approved N95 masks for childrenāÆcurrently.
Who Shāould NOT Wear a Maskā
Wearing a mask may be difficult for people with sensory, cognitive, or behavioral conditions. Masks are not recommended for children under 2 years of age. They are also not recommended for persons who have trouble breathing, are unconscious, or unable to remove the mask without help. Mask wearing can also be hard for people who are hard of hearing. Or also communicate with a person who is hard of hearing. This is because seeing the mouth may be needed to communicate. ā
Other Considerations
A person who is wearing a mask cannot be kept from joining an activity or entering a venue (e.g., schools or childcare). Unless wearing a mask would pose as a safety hazard. ā
This information is intended for a general audience. Some workplacesāāÆ(PDF), local health departments, and Cal/OSHA may have more recommendations or requirements for wearing a mask. āā