NYC-WTC_000182689

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan November 5, 2001 Indoor Air Quality Assessment Page 4 Stuvvesant High School fM477) ATC Project No. 15-19125-0246

ATC was informed that filters with a higher efficiency rating were installed on the HVAC units that serve rooms on the 4^1, 6^1 and 7^1 floors (See Attachment, 1). The PM2.5 concentration range for those rooms was 45-71 gg/m^ with an average of approximately 57 pg/m-’. The PM?.5 concentration range for the other rooms was 38 - 81 pg/m^ with an average of approximately 56 pg/m^.

Ti^OC Concentration

TVOCs were not detected anywhere inside the building (0.0 ppm). 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; • One or more windows were open in Rooms 239, 638, 736, 738, 931 and 1004; • No smoke odor was detected in the building.

FINDINGS

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

1. Measurements of relative humidity and concentrations of 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. One hundred and two (89%) temperature measurements were above the range recommended by ASHKAE 55-1992.

4. Twenty respirable particulates measurements were above the NPAAQS of 65 pg/m^ 24-hour average concentration of particulate matter 2.5 micrometers or less in aerodynamic diameter.

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. The higher efficiency filters installed on the HVAC units for rooms on the 3rd, 4th, 6th and 7th floors did not reduce respirable particulate levels compared to the other rooms.

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NYC-WTC_000182692