NYC-WTC_000188540

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan October 26, 2001 Indoor Air Quality Assessment Page 4 Stuvvesant Hieh School fM477) ATC Project No. 15-19125-0246

TVOC Concentration

TVOC concentrations indoors were 0.0 ppm for all readings. These concentrations were below the AIHA guideline of 1 ppm for non-industrial buildings. 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; • All windows were closed except for windows in Room 931 and Room 1004; • No smoke odor was detected in the building;

FINDINGS

Based on the visual inspection of the occupied spaces and real-time measurements, the following findings are presented:

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

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

3. Five (5) temperature measurements were above the range recommended by ASHRAE 62- 1999,

4. One (1) relative humidity measurement was marginally above the range recommended by ASHRAE 55-1992.

CONCLUSION

Based on our observations and measurements, ATC concludes that the assessed locations were suitable for occupancy at the time of ATC’s investigation. Some individuals may find the conditions in some rooms to be uncomfortable. The elevated CO2 levels indicate the need for increased outdoor air.

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NYC-WTC_000188543