NYC-WTC_000196919

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 16, 2002 Respirable Particulate Monitoring Page 2 Various Locations/Manhattan ATC Project No. 15-19125-0314

TARGET GUIDELINES FOR AIR QUALITY PARAMETERS EVALUATED* ^Tiyi

Respirable 65 micrograms per cubic Particulates meter of air (gg/m^) 24 USEPA NPAAQS (PM2.5) hour average Respirable USEPA recommendation Particulates 40 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-nine (29) indoor and thirty-one (31) outdoor respirable particulates measurements* were collected from twenty-nine school locations in Manhattan, ranging from West 11*^ Street to East 33"^ Street. The measurements were made from 5:50 A.M. to 5:25 P.M. The lAQ field report forms are provided as the Attachment.

The outdoor PM2.5 concentrations ranged from 32 gg/m^ to 63 pg/m^. The indoor concentrations ranged from 9 pg/m^ to 52 pg/m^. None of the indoor or outdoor readings were above the NPAAQS of 65 pg/m^. Twenty-one (21) of the outdoor measurements and eight (8) of the indoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 Mg/ni3.

* 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^. Twenty-one (21) of the outdoor and eight (8) of the indoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 pg/m3.

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 Rgyie'Wfed by 'V • / / Yiannis Efstathiou ■James R. Cohn, CIH, CSP / Senior Project Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_003044041

NYC-WTC_000196920