NYC-WTC_000227030

NYC 9/11 Public Portal Document

a 24-hour average.

TVOC Concentration

TVOCs were not detected anywhere inside the buildmg (0.0 ppm). The outdoor TVOC concentration was also 0.0 ppm.

OBSERVATIONS

During this assessment, ATC noted the following: • The interior of the building appeared clean and free of dust and debris; • The building was occupied at the time of the assessment; • No smoke odor was detected in the building; • The portable HEPA air purifier in rooms 638 and 740 were turned off.

FINDING

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

1. Concentrations of respirable particulates, CO and TVOCs were within applicable standards and guidelines.

2. Twelve (12) CO2 measurements were above the range recommended by ASHRAE 62-1999. All others were below the recommended maximum concentration.

3. All indoor measurements of relative humidity were below the ASHRAE-recommended range of 30 to 60 percent for occupant comfort.

4. Four (4) 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).

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, A TC ASSOCIA TES INC. Reviewed by:

Andreas C. Andreou James R. Cohn, CIH, CSP Senior Project Manager Regional Manager Industrial Hygiene Division

Attachment

CITY_21MC100_002897778

NYC-WTC_000227033