Regional features of the chronic respiratory diseases in workers employed in the copper production
We have performed an investigation of prevalence of the chronic respiratory diseases among workers employed at the enterprises of copper metallurgy located in different climatic regions in Russia and neighbor countries. An increased incidence of chronic bronchitis among the workers in the far North was revealed. An important feature in this case was a combination of the high prevalence with the paucity of physical signs of the pulmonary abnormity.