NYC-WTC_000187689

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 6. 2002 Indoor Air Quality Assessment Page 4 If S. I5QM_________________ ATC Protect No. 15-19125-0289

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

Tl^'OC Concentrations

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

OBSERVATIONS

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

FINDINGS

leased on the real-time measurements, the following findings are presented:

1. Concentrations of CO, CO2 and TVOCs were within applicable standards and guidelines; None of the PM2.5 measurements were above the NP.AAQS of 65 pg/m^ or above the USEP..A recommended PM2.5 concentration of 40 pg/m^ for sensitive individuals and children. 3. Twenty -eight (28) of the temperature measurement 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 indoor 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 sertdces 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: .4 TC ASSOCIA TES LNC.

' ’i'lannis Efstathiou James R. Cohn, CIH, CS? Project Manager Regional Manager Industrial Hygiene Division Attachment

CITY_21MC100_002954336

NYC-WTC_000187692