Concentrations of 30 elements in the atmospheric particulate material were determined by three defferent nuclear activation
techniques, namely; photon, thermal neutron and 14 MeV neutron activation analysis. Trace element concentrations observed
were interpreted in terms of Enrichment Factor, EF, of each element with respect to crustal abundance and coal in order to
find any possible correlation between the existance of highly enriched elements in the atmosphere and pollution source materials.
It was also found that enrichment factors of elements are inversly proportional with the size of particulate material.