NYC-WTC_000187673

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 20. 2002 Indoor Air Quality Assessment Page 4 P. S, 150M ATC Project No. 15-19125-0289 respirable particulate concentration measurements ranged from 30 to 46 pg/in^ with an average of 39 pg/m-'.

* The measurements made during this assessment were instantaneous readings, the NPAAQS is a 24-hour average.

TVOC ConceHtrations

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

OBSERVATIONS

During this assessment, ATC noted the following; • Tliere was construction work going on in the plaza; • Thie school building was occupied at the time of the assessment; • No smoke odor was detected in the building;

FINDINGS

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

1. Concentrations of CQ, CO2 and TVOCs were within applicable standards and guidelines. 2. None of the indoor or outdoor PM2.5 measurements were above the NPAAQS of 65 pg./m^- Tltree of the outdoor measurements were above the USEPA recommended PM2.5 concentration of 40 pg/m-^ for sensitive individuals and children. 3. All of the temperature measurements were within the range of 68 to 75^ F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 4. Sixteen (16) measurements of relative humidity were below the ASHRAE recommended range of 30 to 60 percent for occupant comfort.

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 211 or 212.

Sincerely, Reviewed by: A TC ASSOCIA TES INC. /■ .

'^'iannis Efstathiou James R. Cohn, CIIl, CSP .Senior Project Manager Regional Manager Industrial Hygiene Division Attachment

CITY_21MC100_002954246

NYC-WTC_000187676