Abstract
This paper gives the details of airborne levels of man-made mineral fibres (MMMF) found during installation of loft insulation in 12 dwellings. About 250 samples of air were collected and analyzed by transmission electron microscopy (TEM). Respirable fibre levels measured in static samples collected in the lofts during installation generally were < 0.1 f ml −1. In living spaces respirable fibre levels were< 0.006 f ml −1. Personal samples on the installers gave < 1 f ml −1, with the exception of a fine glass fibre blanket. A few selected samples were also analyzed by phase contrast optical microscopy (PCOM) which showed lower values than those recorded by TEM. Static gravimetric concentrations in the lofts were in the 0.3–6.5 mg m −3 range, and in the living spaces 0.11–0.44 mg m −3, but in both environments most of this dust was not MMMF.
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