Power generation including coal-fired power stations is responsible for much less particulate and Nox emissions but generally more SO2 emissions than mobile sources such as road traffic. Most emissions are continuing to decline. Widespread use of ESP or baghouses on coal-fired power stations have substantially reduced the mass of primary particulate emissions. However, the emitted particles are in the finer particle size range. The smallest particles are of most concern. Those equal to or less than 10 um in diameter are termed PM10 and the fine particles of diamater <2.5 ?m are PM2.5. Gaseous emissions . . .
