The Indian Space Research Organization (ISRO) is operating a network of aerosol observatories under ISRO Geosphere Biosphere Programme. One of the parameters being measured from this network is the black carbon mass concentration. The long-term measurements of black carbon over the Indian region from the aforesaid regional network of aerosol observatories clearly shows a decreasing trend (0.24 µg m-3year-1) in the past decade.The Government has taken several measures to control black carbon emissions.