NYC-WTC_000202213

NYC 9/11 Public Portal Document

Mr. BernardR: Orlan 7 February 27, 2002 Indoor Air Quality Assessment (Page^A P. S. 89M ATC Project No. 15-19125-0297 individuals and children. The outdoor respirable particulate concentration measurements ranged from 28 to 36 jug/mS with an average of 34 fjg/m-^.

* The measurements made during this assessment were instantaneous readings, the NPAAQS is a 24-hour average. i j /■ < . ; -y :

TVOC Concentrations

TVOCs were not detected anywhere inside the building (0.0 ppm). The outdoor TVOC concentration was also 0.0 ppm.

OBSERVATIONS

During this assessment, ATC noted the following: 2 • The school building was partially occupied (IS89) at the time of the assessment. • No smoke odor was detected in the building • The interior of the building appeared clean and free of dust and debris.

FINDINGS

Based on the real-time measurements, the following findings are presented;

1. Concentrations of CO, CO2 and TVOCs were within applicable standards and guidelines. 2. None of the indoor or outdoor PM2,5 measurements were above die NPAAQS of 65 qg/m^ or above the USEPA recommended PM2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Twenty-seven (27) of the temperature measurements were above the range of 68 to 75O F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 4. Forty-six (46) of the indoor measurements of relative humidity were within the ASHRAE recommended range of 30 to 60 percent for occupant comfort. All other measurements were belowthcASHRAErecommendedrange.

It is our pleasure to provide these indoor air quality services to the New York City Board of Education. If you have any questions about this report, please call (212) 353-8280, extension 261 or212. ' i i j ■ hi ■

Sincerely, Reviewed by: ATC ASSOCIATES INC.

'iaimis Efstathiou James R. Cohn, CIH, CSP Project Manager Regional Manager Industrial Hygiene Division Attachment

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