These problems are caused by the release of pollutants such as sulphur and nitrogen when fossil fuels are combusted.
Her bed looked as if a flock of geese had combusted over it, and she counted at least ten dead pillows.
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.