NYC-WTC_000217747

NYC 9/11 Public Portal Document

Mr, Bernard P. Orlan March 15,2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No. 15-19125-0279

46 to 76 pg/m^ with an average of 53 pg/m^. One (1) of the outdoor PMt 5 measurement was above the NPAAQS of 65 pg/m^

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

TVOC Concentration

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: • The 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 CO ,CO2and TVOCs were within applicable standards and guidelines. 2. One (1) of the outdoor PM2.5 measurement was above the NPAAQS of 65 pg 'm^. All nine (9) outdoor and eleven (11) indoor measurements were above the USEPA recommended P^2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Thirty-six (36) of the measurements of relative humidity were below the ASIIRAE recommended range of 30 to 60 percent for occupant comfort. 4. Thirty-one (31) of the temperature measurements were above the range of 68 to 75“F (at 50 percent relative humidity) as recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions).

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 211or212.

Sincerely, 4 TC ASSOCIA TES INC. Reviewed by:

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

Attachment

CITY_21MC100_002877696

NYC-WTC_000217750