the aim of the work was to search for the correlation between the environmental pollution and the ratio of congenital malformations found in the population of 54,493 newborn infants of three silesian towns : bielsko-biala ( situated in the mountains , close to a recreation part of the country ) , bytom ( situated in the center of an old industrial district , where industry is responsible for very high environmental pollution ) , and tarnowskie gory ( situated close to vast woodlands , where very high environmental concentration of heavy metals is caused by an outdated , big zinc plant ) .
C0347988
heavy metals
C0043481
zinc