NYC-WTC_000196911

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 10, 2002 Respirable Particulate Monitoring Page 2 Various Locations/Manhattan ATC Project No. 15-19125-0314

TARGET GUIDELINES FOR AIR QUALITY PARAMETERS EVALUATED*

... Respirable 65 micrograms per cubic Particulates meter of air (pg/m^) 24 USEPA NPAAQS (PM2.s) hour average Respirable USEPA recommendation Particulates 40 gg/m^ 24 hour average for children/sensitive (PM2.5) individuals USEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard

REAL-TIME SAMPLING RESULTS

Twenty-seven (27) indoor and thirty (30) outdoor respirable particulates measurements* were collected from twenty-five school locations in Manhattan, ranging from West 11^^ Street to East 25^** Street. The measurements were made from 5:30 A.M. to 4:45 P,M. The lAQ field report forms are provided as the Attachment.

The outdoor PM2,5 concentrations ranged from 27 pg/m^ to 61 pg/m^. The indoor concentrations ranged from 19 pg/m^ to 41 pg/m\ None of the indoor or outdoor readings were above the NPAAQS of 65 pg/m^. One (1) of the indoor and fourteen (14) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 pg/m^. * These measurements were instantaneous readings, the NPAAQS and the recommendation for children are 24-hour averages.

CONCLUSION

Based on our measurements, none of the indoor or outdoor readings were above the NPAAQS of 65 pg/m^. One (1) of the indoor and fourteen (14) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 pg/m^.

It is our pleasure to provide these air quality consultative services to the New York City Board of Education, If you have any questions about this report, please call (212) 353-8280, extension 212 or 211.

Sincerely, ATC ASSOCIATES INC. Reviewed by:

Yiannis Efstathiou James R. Cohn, CIH, CSP Senior Project Manager Regional Manager, Industrial Hygiene Division

Attachment

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CITY_21MC100_003043392 NYC-WTC_000196912