NYC-WTC_000211863

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan March 28, 2002 Indoor Air Quality Assessment Page 4 H.S. for Leadership & Public Service ('M894') ATC Project No. 15-19125-0290 the twelve (12) instantaneous outdoor measurements were above the USEPA recommended concentration of 40 p-g/m^ for sensitive individuals such as asthmatic people and children.

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

TVOC Concentration

The TVOCs concentrations were 0 ppm inside the building. These concentrations were below the AIHA guideline for odor control of 1 ppm. The outdoor TVOC concentration was also 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;

FINDINGS

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

1. Concentrations of CO2, CO and TVOCs were below applicable standards and guidelines. 2. One hundred and seventeen (117) indoor measurements for temperature were above and eleven (11) measurements were within the range of 68 to 75°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the heating season (wintertime conditions). 3. Fifty (50) of the indoor measurements for relative humidity were below and seventy-eight (78) measurements were within the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. All of the indoor measurements for PM2.5 were below the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter and the USEPA recommended concentration of 40 pg/m^ for sensitive individuals such as asthmatic people and children. Five (5) of the outdoor measurements for PM2.5 were above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter. Nine (9) of the twelve (12) instantaneous outdoor measurements were above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals such as asthmatic people and children.

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