Indoor air quality report, DeSoto School, Aug 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan August 28, 2002 Indoor Air Quality Assessment Page 4 P.S. 130 M ATC Project No. 15-19125-0345

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

TVOCConcentrati^

The TVOCs indoor concentrations ranged from 0.1 to 0.2 ppm. These concentrations were below the AIHA guideline for odor control of 1 ppm. The outdoor TVOC concentration was 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 not 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 CO and TVOCs were within applicable standards and guidelines. 2. Thirty-nine (39) of the indoor measurements were above the range of 73 to79 °F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the summer season. 3. All of the indoor measurements for relative humidity were within the ASHRAE- recommended range of 30 to 60 percent for occupant comfort. 4. One (1) of the indoor measurement for CO2 was above the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The outdoor (background) CO2 concentration was 430 ppm. The highest reading was measured in room 304 with 21 occupants at 9:55 AM. Carbon dioxide measurements are used as an indicator of available outdoor air. The primary source of CO2 indoors is occupant respiration. 5. None of the indoor 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. Eight (8) of the forty-eight (48) instantaneous indoor readings were above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals such as asthmatic people and children. All of the outdoor measurements for PM2.5 were below the NPAAQS of 65 pg/m3 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.

CONFIDENTIAL, CITY_2IMCl00_003430413 SUBJECT TO PROTECTIVE ORDER NO. 2, SEPT. 2008

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