The present study is one of the first attempting to assess the problem of indoor air pollution in an urban village of the Indian capital, Delhi. Indoor air sampling was carried out for the period of Jan–May 1999, using an 8-stage cascade impactor (Anderson sampler), at a constant flow rate of 1 CFM (28.31 l·min–1), with an impactor pre-separator which cuts off particles larger than 10 µm in aerodynamic diameter. Glass fibre filter papers were used for all sampling. Cascade impactor samples were digested in two fractions of PM10 viz. coarse (>2.1 µm) and fine (<2.1 µm). Total PM10 concentration, both coarse and fine, was measured. The samples collected were analysed for trace metals by atomic absorption spectrometry (AAS), using a model Philips PU-9200X. A considerable amount of the PM10 (both coarse and fine fractions) was found to be heavy metals, in addition the anions SO42–, NO3– were found in the indoor environment regardless of the level of indoor activity. Analyses of sulphate (SO42–) and nitrate (NO3–) were carried out using a Hitachi U-2000 UV-VIS spectrophotometer.

Keywords:
Indoor, Respirable dust, PM10, Heavy metals, SO42–, NO3–
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© 2001 S. Karger AG, Basel
2001
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