The book is written by the authors of the absorptively - electrochemical method of air purification from hydrogen sulfide on the basis of the results of many years research. The book contains data on: physical and toxicological properties of H2S; dynamics of the formation and hydrogen sulfide release from sewage into the environment; hydrogen sulfide oxidation processes in moist air and air containing droplet moisture; hydrogen sulfide absorption processes by catholyte and anolyte formed from distilled and tap water; technological schemes of the absorptively-electrochemical installation for air purification from hydrogen sulfide and the features of their operation. The book will be useful to students studying disciplines in the direction of "Environmental safety"; engineers and scientists designing and operating equipment of air and gas purifying systems.