Mercury enters the atmosphere from coal combustion in a gaseous form. However, de-dusting installations, such as electrostatic precipitators (ESPs) and fabric filters (FFs) can also remove up to 30 % of Hg from exhaust gases.
汞以气体形式由燃煤进入大气，然而，除尘装置，例如静电除尘器（ESP）和织物过滤器（FF）可将汞从废气中去除，去除效率可达30%。