NYC-WTC_000205292

NYC 9/11 Public Portal Document

0^pe/2/)02 11:29 FAX 212 353 8306 ATC 0003

Mr. Bernard P. Orlan May 6,2002 Indoor Air Quality Assessment Page 2 P. S. 89M________________ ATC Project No. 15-19125-0297 presented in this report should be used by the BOE as a guide to assess the need for further improvements in current indoor air quality control activities.

EVALUATION CRITERIA

Currently, there are no regulatory 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 puhlications;

f'entilation for Acceptable Indoor Air Qualify (ASHRA£ 62-1999), American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE); Thermal Environmental Conditionsfor Human Occupancy (ASHRAE 55-1992); Industrial Hygienists Ouicle to Indoor Air Qualify 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 jot assure that acceptable indoor air quality will be achieved at all times.

TABLE TARGET GUIDELINES FOR INDOOR AIR QUALITY PARAMETERS EVALUATED i

B Carbon Dioxide <700 parts per million (ppm) ASHRAE62 (CO2) above background level Carbon Monoxide 9 ppm ASIIRAE 62 (adopted from (CO)____________ USEPA NPAAQS) Respirable 65 micrograms per cubic meter USEPA NPAAQS Particulates (PM2.5) of air (pg/in3) 24-hour ayerage 40 jig/m^ 24-hour averagje USEPA - Recommendation for children / sensitive individuals Temperature Summer; 73-79"F at 50% RH ASHRAE 55 Winter 6S-75“F at 50% RH Relative Humidity 30-60% ASHRAE55 Total Volatile Organic Compounds 1 ppm AIHA (TVOC) USEPA = United States Environmental Protection Agency NPAAQS = National Primary Ambient-Air Quality Standard AfflA = American Industrial Hygiene Association

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