Rajasthan is rich in non-metallic and industrial minerals. The minerals found in the state include limestone, dolomite, lignite, barytes, calcite, clay, emerald, feldspar, fluorite, garnet, gypsum, potash, rock-phosphate, silica sand, siliceous earth, soapstone, wollastonite, marble, granite, sand stone and slates. The process of the mineral grinding industry involves generation of harmful air pollutants and requires water in the process and hence it is has been categorized as red category industry. It is, therefore, mandatory that mineral grinding industry must adopt appropriate measures to prevent discharge of pollutants in the air and water and must also have adequate arrangement for scrubbing the particulate matter in the premises of the industry itself.