A comparison of parallel dust and fibre measurements of airborne chrysotile asbestos in a large mine and processing factories in the Russian Federation.

•This is one of the largest reported analyses of parallel dust and fibre measurements in a chrysotile mine and processing factories to date.•Conversion factors from dust to fibres varied by unit and, in the mine, by season. They were also dependent on actual dust concentrations.•These results enable estimation of historical fibre exposure for epidemiological exposure response analyses.