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The combustion of all types of coal produces CO2 emissions and other hazardous gases like SO2 etc. The use of high grade coal such as anthracite coal for briquettes makes an environmentally friendly fuel. The anthracite coal is a naturally occurring clean fuel, but the cost and limited reserves of anthracite coal restricts its use for coal briquetting. Environmentally safe briquettes can be produced by applying various techniques during manufacturing. De-volatilization is the most common technique applied for producing low smoke coal briquettes. De-volatilization can be done by a heat treatment process involving the infusion of chemicals like calcium hydroxides. Heat treatment and additives decrease the emissions of harmful gases by fixing the sulfur and nitrogen content in the coal.