Only 66 billion out of a huge 400 billion bricks are made of fly ash every year, according to a study conducted by the city-based Institute for Solid Waste Research and Ecological Balance. The study underscores the need to use more fly ash bricks in construction of buildings as it prevents two things: further contamination of the environment by the huge quantities of fly ash generated by thermal units as well as the usage of top soil for clay bricks, according to N. Kalidas, director of the institute.
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