September 21, 2005 Page 1 of 2 

Interim Recommendations: Respiratory Protection for 

Residents Reentering Previously Flooded Areas and Homes 

Do I need to use a respirator when I go home? 

If you need to collect belongings or do basic clean up in your previously flooded home, you do not usually 

need to use a respirator (a mask worn to prevent breathing in harmful substances). Times when you may 

want to use a respirator are explained below. 

Inside Your Home or Other Buildings 

Before you enter your home or any other building, make sure it: 

• Is structurally safe 

• Doesn’t have natural gas leaks or other safety problems 

You do not usually need to wear a respirator when you are inside a home or building unless you are doing 

something that creates a lot of dust in the air like sweeping dust, using power saws and equipment, or 

cleaning up mold. If you have to be around dust, 

• Limit your contact with the dust as much as possible. 

• Use wet mops or vacuums with HEPA filters instead of dry sweeping. 

• Wear a respirator that protects against dust in the air. 

You can find more information about building safety at the following websites: 

• Reentering Your Flooded Home

(http://www.bt.cdc.gov/disasters/mold/pdf/reenterfloodedhome.pdf)

• Potential Environmental Health Hazards When Returning to Homes and Businesses 

From US Environmental Protection Agency 

(http://www.epa.gov/katrina/sep14returnhomeadvisory.htm)

• Repairing Your Flooded Home

From the Red Cross 

(http://www.redcross.org/services/disaster/0,1082,0_570_,00.html)

The N95 respirator (or N95 mask) has been approved by CDC/NIOSH and can give you some protection 

from dust and mold in the air. They must fit well and be worn correctly to protect you. You can buy 

N95 respirators in safety supply stores and in most home improvement and hardware stores. If you have 

trouble breathing or have any other trouble when you wear a respirator for cleanup work, stop working 

and contact a doctor or other medical provider. 

More information about mold in buildings can be found at the following websites: 

• Protect Yourself from Mold

(http://www.bt.cdc.gov/disasters/mold/protect.asp) 
Respiratory Protection for Residents Reentering Previously Flooded Areas and 

Homes 

 (continued from previous page) 

 September 21, 2005 Page 2 of 2 

• A Brief Guide to Mold, Moisture, and Your Home

From US Environmental Protection Agency 

(http://www.epa.gov/mold/cleanupguidelines.html)

Outside Your Home or Other Buildings 

You do not usually need to wear a respirator when you are outside because the outside air is generally 

clean. However, when you are in a very dusty environment (you may be shoveling debris, sweeping dust, 

or using power equipment), then you may want to wear a respirator like the N95 respirator that is 

described above. 

Note 1: If you wear an N95 respirator, read and follow the manufacturer’s instructions on the package or 

insert. This will help you choose the best size of respirator and to wear it properly. Beards will prevent the 

respirator from fitting tightly. Because respirators are meant to be used by healthy workers who have the help 

of training, medical evaluations, and proper fit, the amount of protection provided to the general public 

may be much less. 

Additional information on respirator use can be found at the following website: 

• Respirator Fact Sheet

What You Should Know in Deciding Whether to Buy Escape Hoods, Gas Masks, or Other Respirators 

for Preparedness at Home and Work. From The National Institute for Occupational Safety and 

Health.

(http://www.cdc.gov/niosh/npptl/topics/respirators/factsheets/respfact.html)

Note 2: No U.S. agency tests and certifies respirators for public use. However, CDC/NIOSH tests and 

certifies respirators for use by workers to protect against workplace hazards. Respirators certified by 

CDC/NIOSH will say "NIOSH Approved" and will have an approval label that identifies the hazard it will 

protect against. The N95 respirator is only approved for dust (from sweeping, sawing, mold removal, and 

other activities that cause dust) in the air. The N95 respirator is not approved for chemicals or gases in 

the air, such as carbon monoxide, and will not protect you from them. If you smell a strong chemical 

odor, you should leave the area right away. 

For more information, visit www.bt.cdc.gov/disasters, 

or call CDC at 800-CDC-INFO (English and Spanish) or 888-232-6348 (TTY).