It is well known that 50-60% of power generated in India is from thermal power stations. These thermal power plants use coal as a fuel. The high ash content of these coals pose a serious problem to the environment. The flyash production rate is about 25 million tonne for every 5 year.
Links:
[1] http://admin.indiaenvironmentportal.org.in/feature-article/physico-chemical-characteristics-flyash
[2] http://admin.indiaenvironmentportal.org.in/category/author/m-k-bhatnagar
[3] http://admin.indiaenvironmentportal.org.in/category/author/prachi-bhatnagar
[4] http://admin.indiaenvironmentportal.org.in/category/author/s-p-singh-0
[5] http://admin.indiaenvironmentportal.org.in/category/journal/pollution-research
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birsingphur
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/coal
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madhya-pradesh
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fly-ash
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution