NYC-WTC_000211000

NYC 9/11 Public Portal Document

Mr. Bernard P. Orlan May 30, 2002 Indoor Air Quality Assessment Page 2 P. S. 89M ATC Project No 15-19125-0297

EVALUATION CRITERIA

Currently, there are no regulatoiy standards for indoor air quality in non-industrial buildings, such as offices and schools. For the real-time data collected, ATC uses the commonly accepted guidelines cited in the following publications:

Ventilation for Acceptable Indoor Air Quality (ASHRAE 62-1999), American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE); Iliermal Environmental Conditions for Human Occupancy fASHRrlE 65-/992); Industrial Hy^rienists Guide to Indoor Air Quality Investigations (1993), American Industrial Hygiene Association (AIHA).

Table 1 lists target guidelines for the parameters that ATC evaluated during this investigation. Meeting one, some, or all of the listed values does not assure that acceptable indoor air quality Wil! be achieved at all times.

TABLE 1 TARGET GUIDELINES FOR INDOOR AIR QUALITY PARAMETERS EVALUATED PARAMETER tar(;et level AGENCY OR ORGANIZATION Carbon Dioxide <700 parts per million (ppm) ASHRAE 62 (CO2) abo\'e background level Carbon Monoxide 9 ppm ASHRAE 62 (adopted from (CO) USEPA NPAAQS) F’espirable 65 micrograms per cubic meter USEPA NPAAQS Particulates (PM2,5) of air (pg/m^) 24-hour average 40 pg,'nv24Tiouraver^e USEPA - Recommendation for children / sensitive individuals Temperature Summer: 73-79°F at 50% RH ASHRAE 55 Winter: 68-75°F at 50% RH Relative Humidity 30 - 60 % ASHRAE55 Total Volatile Organic Compounds 1 ppm AIHA (TVOC) L’SEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard •MHA = American Industrial Hygiene Association

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NYC-WTC_000211001