Abstract: An index of indoor chemical pollution has been developed on the basis of more than 1200 surveys in dwellings conducted by the Regional Unit for Indoor Pollution Intervention (French acronym CRIPI) in the Brussels-Capital Region. This tool is intended for giving assistance in medical diagnosis. It provides a rapid evaluation of the contamination level by volatile organic compounds of a dwelling. It is also useful in cases where one of the most frequently found compound shows a particularly high concentration. The index has been developed for benzene, toluene, pinene, limonene, triclorethylene, tetrachlorethylene and formaldehyde. It allows for facing the lack of reference standard in Belgium.