Indoor air quality report, M833 school, May 2002

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Mr. Bernard P. Orlan May 28, 2002 Indoor Air Quality Assessment Page 3 H.S. of Economics and Finance (M833)________ ATC Project No. 15-19125-0291 Real-Time Environmental Measurements

ATC collected one hundred (100) sets of real-time environmental measurements consisting of eighty-eight (88) inside the school building and twelve (12) outdoors. Field data sheets are found in the Attachment. Readings were collected between morning to evening. The results are described below.

Temperature

Indoor diy bulb temperature measurements ranged from 72.1 °F to 79.3 °F. Two (2) of the indoor measurements for temperature were below and three (3) indoor temperature measurements were above the range of 73 to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the summer season. The outdoor temperature measurements ranged from 69.9 °F to 84.5 °F,

Relative Humidity

The relative humidity indoors ranged from 36.1 percent to 45.7 percent. All of the indoor measurements for relative humidity were within the ASHRAE recommended range of 30 to 60 percent for occupant comfort. The outdoor relative humidity ranged from 40.4 to 47.1 percent.

Carbon Dioxide Concentration

Carbon dioxide concentrations indoors ranged from 499 ppm to 1223 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 561 ppm. Therefore, the maximum acceptable level of CO2 at this location was 1261 ppm (background level + 700 ppm). Levels above the recommended maximum do not indicate a health risk. Carbon dioxide measurements are used as an indicator of available outdoor air. Tire primary source of CO2 indoors is occupant respiration.

Carbon Monoxide Concentration

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

Respirable Particulates (PM2,5)

Respirable particulate concentrations* indoors ranged between 6 pg/m^ to 19 pg/m^ with an average of 12 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 in aerodynamic diameter or above the USEPA recommended concentration of 40 pg/m^ for sensitive individuals and children. The respirable concentrations outdoors ranged between 29 pg/m^ to 41 pg/m^ with an average of 34 pg/m3 •

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

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