大气中的PM2.5颗粒对人体健康有长期的不利影响，越来越受到关注。火电厂PM2.5颗粒排放占全社会总量的10％。袋式除尘器能捕捉大多数PM2.5颗粒，高效静电除尘器如选用合适的电源和比集尘面积也能大大提高PM2.5颗粒的捕捉能力。实验室测试表明2种除尘器对PM2.5的捕捉率都可达到90％。除了采用高效除尘器外，降低电厂NOx和SO2的排放也是火电厂减少PM2.5颗粒排放的有效和必要措施。

PM2.5 particle in atmosphere, which is harmful to the people’s health, has been drawing more and more attention. The emission amount of PM2.5 from thermal power plants covers about 10% of total output by human activities. Bag filter has high capture efficiency for PM2.5, and electrostatic precipitator(ESP) could increase its collecting efficiency for PM2.5 by selecting proper power facilities and specific collecting area. It is shown by laboratory tests that the capture efficiency for two types of dust collector could be up to 90%. Besides of using high-efficient dust collector, measurements such as decreasing emission of NOx and SO2 are effective and necessary to reduce PM2.5 output from power plant.