NYC-WTC_000189316

NYC 9/11 Public Portal Document

Mr Bernard P Orlan March 22 2002 Indoor Air Quality Assessment Page 2 H S for Leadership <fe Public Service (M894') ATCProiectNo 15 19125 0290

The results of the sampling represent conditions found on the dates of the survey and may not represent conditions found at other times The information presented m 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 mdoor 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

Ventiiation for Acceptable Indoor Air Quality (ASHRA£ 62 1999) American Society of Heating Refrigerating and Air Conditionmg Engineers (ASHRAE) Thermal Environmental Conditions for Human Occupancy (ASHRAE 55 1992) Industrial Hygienists 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 mdoor air quality will be achieved at all times

TABLE 1 TARGET GUIDELINES FOR INDOOR AIR QUALITY PARAMETERS EVALUATED

iPAWMEE: 0^GET«LEV

Carbon Dioxide <700 parts per million (ppm) ASHRAE 62 (CO2) above background level Carbon Monoxide 9 ppm ASHRAE 62 (adopted from (CO) USEPA NPAAQS) Respirable 65 micrograms per cubic meter USEPA NPAAQS Particulates (PM2 5) of air (p.g/m3) 24 hour average 40 pg/m^ 24 hour average 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) USEPA = United States Environmental Protection Agency NPAAQS = National Prunary Ambient An Quality Standard AIHA = American Industrial Hygiene Association

CITY_21MC100_003085550

NYC-WTC_000189317