The human-generated half can be divided into the following estimated percentages: 65% from stationary combustion, of which coal-fired power plants are the largest aggregate source (40% of U.S. mercury emissions in 1999).
人类活动产生的另一半可以细分为以下来源： 65%来自燃料的燃烧，其中烧煤的火力发电站是最大的来源（美国1999年40%的汞排放来源于此）。