NYC-WTC_000199192

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 18,2002 Indoor Air Quality Assessment Page 4 P. S. 234M ATC Project No. 15-19125-0279

outdoor respirable particulate concentration ranged from 124 pg/m^ to 167 pg/m^ with an average of 156 pg/m^.

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

T^OC 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.

FINDING

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

1. Concentrations of CO ,CO2and TVOCs were within applicable standards and guidelines. 2. Two (2) indoor measurements for temperature were above and eight (8) measurements were bellow the range of 73 to 79°F (at 50 percent relative humidity) as recommended by ASHRAE Standard 55-1992 during the summer season. 3. All indoor measurements for relative humidity were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. Twenty nine(29) of the indoor measurements for respirable particulates were above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and forty six (46) indoor measurements were above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals and children.

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, A TC ASSOCIA TES INC. Reviewed by:

Prasad Doddapaneni James R. Cohn, CIH, CSP Senior Project Manager Regional Manager, Industrial Hygiene Division

Attachment

CITY_21MC100_003032268

NYC-WTC_000199195