A methodology for the selection of pollutants for ensuring good indoor air quality using the de-trended cross-correlation function

CO2 is customarily used to control ventilation as it a proxy for bio-effluents and pollutants related the presence activity of people in room. However, could not be satisfactory indicator that do have metabolic origin, i.e., emissions from building materials or traffic. A methodology select besides instead presented this article. This sets study (i) suitable location measure air (ii) which parameters measure. The answers these two questions are based on correlation analysis between indoor/outdoor ratios. Measurements CO2, temperature, relative humidity, formaldehyde, particulate matter been taken an office, industrial kitchen, gym show how apply methodology. Correlations were studied detrended (pre-whitened) time series. Studying correlations series via cross-correlation functions recommended because coefficients may overestimated trends In contrast Pearson's coefficient, function studies concurrently (as Pearson) but also at different lags. From measurements we can conclude need least one parameter representing: 1)pollutants human activities 2)pollutants infiltrate processes like combustion traffic outdoors, 3)pollutants indoors, 4)pollutants degassing materials, 5)pollutants other “non-combustion-related activities” indoors moisture loads.