The composition of emissions and equipment and technological schemes of neutralization of gases formed at various stages of production of cast iron, steel, coke, refractories and in some technological processes carried out at ferrous metallurgy enterprises are considered. Particular attention is paid to the use of captured products and the resulting production waste. Data on the economics of gas purification in various devices and the use of waste are given. Economic problems of environmental protection are considered. FOR students of metallurgical specialties of universities.