CONCENTRATION VARIATIONS OF POLLUTANTS IN A WORK WEEK PERIOD OF AN OFFICE

Indoor air quality problems for a typical office space were investigat ed. Continuous monitoring of concentrations was carried out for CO2, C O, formaldehyde, and total hydrocarbons. It was found that the CO2 con centration was at times above 2000 ppm and that for CO above 14 ppm. I n addition, concentration levels of formaldehyde and total hydrocarbon were found to peak at midnight and indicated non-human sources. Parti al opening of windows resulted in CO2 concentration levels of 800 ppm or below. Ventilation rate measurements using trace gas decay method f ound that the air change rates were well below one air change per hour . (C) 1997 Elsevier Science Ltd.