Room air contaminants and their health hazard. Huoneilman epapuhtauksien terveydellisesta merkityksesta.

In dwellings and similar spaces with limited volume, dilution of indoor air contaminants may be insufficient. The concentration of contaminants in the inside air depends partly on the rate of emission into the room, partly on the ventilation and the concentration of impurities in the outside air. Sulphur dioxide, hydrocarbons, ozone and lead compounds occur in higher concentrations in the outside air, whereas nitrogen oxides, carbon monoxide, benzpyrene (from tobacco smoke), formaldehyde and dust have higher concentrations indoors. The hazardous health effects of contaminants may be estimated by looking at the places where the recommended maximum values of pollutants occur, such as in cities.