Several locations of Jharia coalfield are affected by fire, and carbon monoxide (CO) is a product of active fires in coal mines. The paper deals with the investigation on emission of CO concentration at surface due to long standing fire at Lodna and Kusunda areas of Jharia coalfield. CO level was high at the point of emission from the surface (> 1000 ppm). CO concentration was confined within the smoke at the areas where only smoke was existing. The lateral spreading of the CO concentration was high all around the outcrop of fire.
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