Indoor air quality report cover letter, P.S. 150M, April 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan April 24, 2002 Indoor Air Quality Assessment Page 4 P. S. 150M ATC Project No. 15-19125-0289 respirable particulate concentration measurements ranged from 9 to 16 pg/m^ with an average of 12 pg/m^.

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

Tl^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: o There was construction work going on in the plaza; o The school building was occupied at the time of the assessment; o 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 below applicable standards and guidelines. 2. Twelve (12) indoor measurements for temperature were below and eighteen (18) measurements were within the range of 73 to 79 °F (at 50 percent relative humidity) as recommended by the ASHRAE Standard 55-1992 during the summer conditions. 3. Thirteen (13) of the indoor measurements were below and seventeen (17) measurements were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. All of the indoor and outdoor measurements for PM2.5 were below the NPAAQS of 65 pg/m^ for 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and the USEPA recommendation 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, Reviewed by: A TC ASSOCIA TES INC.

Javal /1 James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division Attachment

CITY_21MC100_002893944

NYC-WTC_000178749