NYC-WTC_000214362

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 17, 2002 Indoor Air Quality Assessment Page 4 P. S. 150M_________________________________________ ATC Project No. 15-19125-0289 respirable particulate concentration measurements ranged from 90 to 106 pg/m^ with an average of 103 pg/m3.

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

TV^OC 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, CO2 and TVOCs were within applicable standards and guidelines; 2. Eighteen(18) of the indoor and all ten (10) outdoor PM2.5 measurements were above the NPAAQS of 65 pg/m^. Twenty-eight indoor measurements were above the USEPA recommended PM2,5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Ten (10) 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. All measurements of relative humidity were within 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.

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

CITY_21MC100_002870389

NYC-WTC_000214365