Volatile Organic Compounds (VOCs) are produced in many industrial fields, generally forming part of air fresheners, lacquers, paints and solvents. Among the most common we find perchloroethylene, ethyl acetate, toluene, xylene or chlorobenzene.
Hydrogen sulphide or sulphuric acid is an inflammable gas, which is colourless and toxic, whose odour is that of decomposing organic material. It is associated with processes such as water purification, the paper industry or biogas production.
Sulphur dioxide is the main cause of acid rain, since it turns into sulphuric acid in the atmosphere. It is released in many combustion processes since fuels such as coal, petrol, diesel or natural gas contain certain amounts of sulphur-bearing compounds.
Dioxins and Furans
Dioxins are characterised by their high toxic potential. In many cases they are produced as a result of burning plastics and chlorine products in urban waste incinerators, metal smelting, whitening paper pulp with chlorine or manufacture of some herbicides and pesticides among others.
Hydrogen fluoride is a highly toxic chemical compound formed by hydrogen and fluorine. It has an impact on the environment and is associated with coal-fired power plants, aluminium smelting, phosphorus-based fertiliser manufacture and the ceramics industry.
There is a group of heavy metals best known for their tendency to cause serious environmental problems, such as mercury (Hg), lead (Pb), cadmium (Cd) and thallium (Tl), as well as copper (Cu), zinc (Zn) and chromium (Cr) among others.
Hydrochloric acid is an aqueous solution of hydrogen chloride (HCl). At room temperature hydrogen chloride is a light yellow, corrosive, non-flammable gas, heavier than air, with a strongly irritating smell. When exposed to air hydrogen chloride forms dense white-coloured corrosive vapours.
iogas is a combustible gas basically made up of methane (between 50% and 70%) and carbon dioxide (CO2) in addition to small amounts of other gases (hydrogen sulphide (H2S), siloxanes, mercaptans) which is produced artificially creating a biological decomposition process
There are thousands of varieties of gaseous pollutants and specific emission problems that we cannot include on this website for practical reasons.