Indoor air quality report, M833 school, June 2002

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 17, 2002 Indoo - Air Quality Assessment Page 3 H.S. cf Economics and Finance fM8331 ATC Project No. 15-19125-0291 Real-Time Environmental Measurements

ATC collected one hundred and six (106) sets of real-time environmental measurements consisting of ninety-four (94) inside the school building and twelve (12) outdoors. Field data sheets are found in the Attachment. Readings were collected between morning to evening. The result! are described below.

Temperature

Indooi- dry bulb temperature measurements ranged from 73.3 °F to 78.7 °F. All of the indoor measurements for temperature were within the range of 73 °F to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the summer season. The outdoor tempe'ature measurements ranged from 64.7 °F to 68.7 °F.

Relate>e Humidity

The relative humidity indoors ranged from 40.0 percent to 56.6 percent. All of the indoor measurements for relative humidity were within ASHRAE recommended range of 30 to 60 percent for occupant comfort. The outdoor relative humidity ranged from 55 to 61 percent.

Carbot Dioxide Concentration

Carbon dioxide concentrations indoors ranged from 426 ppm to 988 ppm. All of the indoor measurements for CO2 were below the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level. The outdoor (background) CO2 concentration was 435 ppm. Therefore, the maximum acceptable level of CO, at this location was 11 35 ppm (background level + 700 ppm). Levels above the recommended maximum do not indicale a health risk. Carbon dioxide measurements are used as an indicator of available outdoor air. The primary source of CO2 indoors is occupant respiration.

Carbon Monoxide Concentration

Carbon monoxide concentrations indoors were 1 ppm for all readings. These concentrations were below the NPAAQS/ASHRAE guideline of 9 ppm. The outdoor CO concentrations ranged from 1 ppm to 2 ppm.

Respirable Particulates (PM^^d

Respirable particulate concentrations* indoors ranged between 1 pg/m’ to 22 pg/m’ with an average of 8 pg/m’ None 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 ir aerodynamic diameter and the USEPA recommended concentration of 40 pg/m^ for sensitive individuals and children. The respirable concentrations outdoors ranged between 16 pg/m’ to 28 pg/m- with an average of 22 pg/m’ ■

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

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