Residential sampling protocol, World Trade Center, Oct 2001

NYC 9/11 Public Portal Document

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DRAFT (October 17, 2001, 2 p.m.) ATSDR, CDC, EPA, OSHA Environmental Assessment Workgroup PM Aclion Levels for World Trade Center Response Respirable Particulate Thoracic Particulate General Public/Recommendations Comments 24 hour PM2.5 24 hour PMio S Ambient Action Level (pg/m’) Ambient Action Level (pg/m’) 0-40 0-155 • No restriction • Air quality is good to moderate. >40-56 >155-255 • People willt respiratory or heart disease, the elderly and children, • Air quality is unhealthy for sensitive groups. should limit prolonged exertion.

>65-150 >25S355 • People with respiratory or heart disease, the elderly and children, • Air quality is unhealthy for all persons. should avoid prolonged exertion; everyone else should limit prolonged • Sensitive groups may experience more exertion. serious health effects. ■

>150-250 >35S425 • People with respiratory or heart disease, the elderly and children, • Air quality is very unhealthy for all persons. should avoid any outdoor activity, everyone else should avoid prolonged • Everyone may experience more serious health exertion. effects. >250 >425 • Everyone should avoid any outdoor exertion; people with respiratory or • Air quality is hazardous for all persons. heart disease, the elderly and children, should remain indoors. • The entire population is more likely to be affected. Inhalable Particulate General Public/Recommendalions Comments 24 hour TSP Screening Level (pg/m’) 250 • Further characterization of particulate is warranted. • Based on NY State Ambient Air Quality • Dust suppression procedures may be warranted. Standard. • Respiratory protection while in the area may be warranted. • Screening level for the general public that

1 requires further evaluation.

1. Developed from EPA Air Quality Index at: httpy/www.epa.gov/aimow/publicalions.html and tlie NY State at:

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NYC-WTC_000178126