Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

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recycle/recirculate mode. Inspect and change air filters and air conditioning filters as needed. When the air quality improves, you should open up and air out your homes.

4. If your home has dust or suspended particles as a result of the WTC collapse, you should consider steps to minimize your exposure. If you decide to clean the dust yourself, the following suggestions can help to reduce the opportunities for dust to re-enter the air. Additional information can be obtained from EPA’s indoor air quality website at http://www.epa.gov/iaq. * A regular vacuum cleaner will clean dusty areas, furniture, and carpeting but small particles will pass through the vacuum and re-enter the air. Alternatively, using a High Efficiency Particulate Arresting (HEPA) vacuum without a beater bar is an effective method to clean and minimize resuspension of dust.

Moisten dusty and sooty, non-porous surfaces prior to wiping them. This will reduce the amount of particulate matter becoming airborne. Some porous materials may be damaged by water and may require specialized cleaning techniques. Avoid breathing the dust if any is stirred-up by wiping, and make sure surfaces are dry once the dust is removed. * Clean roof-top and building air conditioning and heating systems before use and assess duct work for signs of contamination. * Replace or clean dirty air conditioner filters and set air conditioners and heaters to re-circulate if indoor air is relatively dust-free. * Wash plants and furnishings prior to moving them indoors.

5. In dusty areas, minimize dust entering the home by leaving shoes outside, using a door mat and wiping pets feet at the doorway.

Air Quality Index;

Health Comparison Guideline Table for Ambient PM* 24 Hour Levels 24 Hour Levels Air Quality Cautionary Statements (Pg/m’) (Pg/m") PMls** PMio** 0-15 0-55 Good None >15-40 >55-155 Moderate None

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