Many industrial plants generate significant quantities of waste and remove gaseous products that reduce visibility and generally pollute the atmosphere. Industrial waste, which discharges are made in groundwater and in the waters of rivers and seas, deteriorating water quality and create an appropriate medium for the proliferation of disease-carrying germs. Among the pollutants may be sulfates, cadmium, arsenic, lead, mercury, fluorine, magnesium bicarbonate, sodium, potassium, phosphorus and chlorinated compounds, and nitrates that in certain concentrations, can cause serious damage to human health and other living beings. The gas industry can also lead directly or indirectly harmful to the environment. For example, sulfur dioxide is a poison that comes from plants burning oil or coal. Aerosols, foams and solvents containing chlorofluorocarbons (CFCs), which are released to the outside to use these products. Ozone, which is an important protector of life and is present in the stratosphere, is a gaseous pollutant in the lower layers of the atmosphere is produced by the interaction of nitrogen oxides and hydrocarbons in sunlight.
These include oil refineries, zinc smelters, the iron and steel, cement manufacturing plants or sulfuric acid and nitric acid.