The present work comprises the unpublished results from the investigation of the air pollution caused by the electric arc welding and oxyacetylene cutting. These results have been obtained in the process of creating of the database, which contains information on the pollutants resulting from technological operations. In the present research the gained experience has been used. In the experiments the technological conditions and circumstances for carbon oxide, carbon dioxide, acrolein, nitric oxide and dust supply have been changed. During this research has bin made confrontation of other researcher’s results.