On the Evaluation of Ambient Air Asbestos Pollution Near an Industrial Source(1)

Stanka I. Deneva, Virgil I. Dimov, Vassil V. Kapurdov, Kamen G. Kamchev, Raina Tz. Goranova, Mimka G. Kotseva

National Center of Hygiene, Sofia, Bulgaria

Corresponding author: Stanka Ilieva Deneva, Bulgaria,
Sofia: 1336, post restante EGN 6003148230

(1)This study was realized with the co-operation of the whole team of the Dust Laboratory of NCH headed by Prof. M. Dobreva.

Keywords:
Chrysotile asbestos, fibre concentrations, ambient air, transmission electron microscopy.

Abbreviations:
TEM = transmission electron microscopy
f/ml = fibres per ml
L = length
D = diameter
L/D = length to diameter

Abstract:
A study of ambient air asbestos pollution was performed near an asbestos-textile factory before (1989) and after (1991) reduction of the asbestos consumption. 2–9 times decreased fibre concentrations were established electronmicroscopically (TEM). The electron diffraction identification of the long (L>5 mm) fibres showed mean asbestos concentrations of 0.004 f/ml in 1989, and of 0.002 f/ml in 1991. The maximum values decreased from 0.048 f/ml to 0.017 f/ml.

Received: 05 January 1998
Accepted: 30 November 1998

Posted: 3 April 1999
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