These problems are caused by the release of pollutants such as sulphur and nitrogen when fossil fuels are combusted.
By extracting the partially combusted coal, thermally activated sorbent is produced.
Pre-heated combusted air is pushed in with small holes which results into a very powerful and efficient fire.
Since fossil fuels consist of carbon and hydrogen atoms, they create carbon dioxide when they are burned, or combusted.
Her bed looked as if a flock of geese had combusted over it, and she counted at least ten dead pillows.