NYC-WTC_000208202

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan February 28, 2002 Respirable Particulate Monitoring Page 2 Various Locations /Manhattan ATC Project No. 15-19125-0314

TARGET GUIDELINES FOR AIR QUALITY PARAMETERS EVALUATED* PARAMETER TARGET LEVEL

Respirable 65 micrograms per cubic Particulates meter of air (pg/m3) 24 USEPA NPAAQS (PM2.5) hour average Respirable USEPA recommendation Particulates 40 (ig/m3 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

A total of sixty-five (65) respirable particulates measurements* were collected from twenty-nine locations in Manhattan, ranging from W. 11* Street to E. 33"- Street. The measurements were made from 7:00 A.M. to 4:35 P.M. The lAQ field report forms are provided as the Attachment.

The outdoor PM2.5 concentrations ranged from 11 pg/m3 to 50 pg/m^. The indoor concentrations ranged from 7 pg/m3 to 35 ug/m^. None of the indoor or outdoor readings were above the NPAAQS of 65 pg/m3. Five (5) outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40pg/m3.

• 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 gg/m^. Five (5) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 p.g/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 261.

Sincerely, ATC ASSOCIATES

Yiannis Efstathfou James R. Cohn, CIH, CSP "Project Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_003020862

NYC-WTC_000208203