Coal 'fly ash'. Coloured scanning electron micro- graph (SEM) of particles of coal fly ash taken from garden air. This is a common atmospheric pollutant emitted from coal-fired power stations. Fly ash is the end product of coal combustion. It can be prevented from escaping from the power station stacks, to some degree, by the use of electrostatic scrubbers and can be recycled for use as ballast in the construction industry. Magnification: unknown.

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