NYC-WTC_000194816

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan February 18, 2002 Indoor Air Quality Assessment Page 4 P. S. 150M ATC Project No. 15-19125-0289

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

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: • There was construction work going on in the plaza; • The 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 CO and TVOCs were within applicable standards and guidelines; 2. None of the PM2.5 measurements were above the NPAAQS of 65 pg/m^ or above the USEPA recommended PM2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Thirty-two (32) of the temperature measurements were above 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, Alt of the indoor measurements of relative humidity were below the ASHRAE recommended range of 30 to 60 percent for occupant comfort. 5i Two (2) CO2 measurements were above the range recommended by ASHRAE 62-1999. All others were below the maximum concentration.

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 or 212.

Sincerely, Reviewed by: A TC ASSOCIA TES INC. T

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

CITY_21MC100_0 04151826

NYC-WTC_000194819