Abstract
This article has focused on gaseous air pollutants and its environmental effect-emitted from tanning industry during leather processing, especially in unhairing & liming, deliming, pickling and finishing operations in which hydrogen sulphide (H2S), ammonia (NH3), chlorine (Cl2) and volatile organic compounds (VOCs) are emitted respectively at Hazaribagh, Dhaka, Bangladesh. The toxic hydrogen sulphide (H2S) gas has negative effect at atmosphere by the process of photochemical reaction; it increases the greenhouse methane gas. In atmosphere, gaseous form of ammonia (NH3) reacts with available acids and form their corresponding salts cause cloudiness and finally they return to earth surface by wet or dry deposition which effects on aquatic life. Workers in tanning industries are directly inhaled toxic chlorine gas suffers withvarious health complexities. Emission of VOCs isthe mostly formaldehyde and it is captured in photochemical oxidation by ozone as well as UV radiation. It's an important precursor of smog formation where it reacts with oxides of nitrogen (NOx) including peroxyacetyl nitrate (PAN); smog decreases the visibility in the urban area.
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