NYC-WTC_000204430

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan June 21,2002 Indoor Air Quality Measurements Page 4 Stuyvesant High School (M477) ATC Project No. 15-19125-0246 In addition to higher efficiency rating filters on their HVAC units, portable High Efficiency Particulate Air (HEPA) purifiers were placed in Rooms 327, 333, 638 and 740. The PM2.5 concentration range for these rooms was 22 - 30 pg/m^ with an average of approximately 26 pg/m3.

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

TVOC Concentration

TVOCs inside the building were 0.0 ppm for all readings. The outdoor TVOC concentrations were 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; • No smoke odor was detected in the building; • The barge operation at Pier 25 has been shut down.

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. Seventy-two (72) of the indoor temperature measurements were below the range of 73 to 79°F (at 50 percent relative humidity) recommended by ASHRAE Standard 55-1992 during the mechanical cooling season (summertime conditions). 3. Eighty-nine (89) of the indoor measurements for relative humidity were above the ASHRAE-recommended range of 30 to 60 percent for occupant comfort. 4. None of the indoor measurements were above the NPAAQS of 65 pg/m^ 24-hour average concenPation of particulate matter 2.5 micrometers or less in aerodynamic diameter or above the USEPA recommendation of 40 pg/m^ for sensitive individuals and children. 5. All of the indoor CO2 measurements were within the ASHRAE Standard 62-1999 recommended maximum concentration of <700 ppm above the background level.

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