Gravimetric determination and continuous monitoring of respirable dust in air has revealed that there are high levels of dust at some roadside and indoor locations in urban areas. Furthermore, where high dust levels are measured in roadside samples, high concentrations are also measured in adjacent buildings. The dust levels measured inside a building have been shown to be very closely correlated to ambient levels, and traffic emissions, particularly from diesel vehicles, are the principal source of respirable particulates.
Until now, there is no widely accepted way to express any index for this purpose and taking into account the large variety of possible pollutants. Things can be simplified if the aim is to compare different systems and strategies rather than to give an absolute value of quality. For the study of a pollutant source, the main important point for comparison is the pattern of its production, whatever this pollutant is. The detailed data for each inhabitant is the curve of the number of hours above a pollutant level concentration Ci: Nh (Ci).
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