NYC-WTC_000218573

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan February 14, 2002 Indoor Air Quality Assessment Page 4 P. S. 89M ATC Proiect No. 15-19125-0297

asthmatic people and children. The outdoor respirable particulate concentration averaged 31 pg/m^ (A.M.) and 11 pg/m^ (P.M.).

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

TVOC Concentration..

TVOCs were not detected (0.0 ppm) anywhere inside or outside the building.

OBSERVATIONS

During this assessment, ATC noted the following:

• The interior of the building appeared clean and free of dust and debris; • The school was partially occupied (I.S. 89) 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 PM2.5, CO2, CO and TVOCs were within applicable guidelines. 2. Five (5) temperature measurements were below and two (2) were above the ASHRAE- recommended range. 3. 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 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, 4 TC ASSOCIA TES INC.

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

Attachment

CITY_21MC100_003775224

NYC-WTC_000218576