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NYC-WTC_000208200

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NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan February 8, 2002 Respirable Particulate Monitoring Page 2 Various Locations/Manhattan ATC Project No. 15-19125-0314

TARGET GUIDELINES FOR AIR QUALITY PARAMETERS EVALUATED* PARA& TARGET 1 VEL AGENCY OR ill ORGANIZATION Respirable 65 micrograms per cubic Particulates meter of air (gg/mS) 24 USEPA NPAAQS (PM2.5) 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

A total of fifty-eight (58) outdoor respirable particulates measurements* were collected from twenty-nine locations in Manhattan, ranging from W. 11th st. to E. 33th St. The measurements were made from 7:30 A.M. to 4:35 P.M. The lAQ field report forms are provided as the Attachment.

The outdoor PM2.5 concentrations ranged from 28 gg/m^ to 85 gg/m-’. The indoor concentrations ranged from 11 gg/m^ to 44 gg/m-. Two (2) outdoor readings were above the NPAAQS of 65 gg/m^. One (1) of the indoor and sixteen (16) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 gg/jn^.

• 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 and two (2) of the outdoor readings were above the NPAAQS of 65 gg/m^. One (1) of the indoor and sixteen (16) of the outdoor measurements were above the EPA recommended guideline for children and sensitive individuals of 40 gg/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 261.

Sincerely, ATC ASSOCIATES INC.

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

CITY_21MC100_003020799

NYC-WTC_000208201

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NYC-WTC_000208201Source: NYC Law Department, mirrored locally

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