الفهرس 
INTRODUCTION
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Abstract
The objective of this research is to develop an improved understanding of the characteristics of air-borne particles, which are very important for controlling air quality in a work environment.
Experimental design was conducted to collect the samples of air-borne particles and prepare these samples in order to be analyzed by the scanning electron microscopy techniques. Air- borne particles were characterized in terms of particle volume equivalent diameters, lengths and widths as well as elemental composition. Mathematical models were derived and used for predicting the dust concentrations. Acceptable dust concentration was determind based on quartz content in the dust particles.
Relationships of dust concentration; with air velocity, distance from the dust source, and sampling height in open atmosphere are in enclosed areas during mining and industrial operations are derived. Dust control methods for these working environmental conditions were suggested.