13 Sep '11, 11am
Did you ever wonder how mercury got into your tuna fish? The answer:
Some of the sources of mercury pollution include metal smelting, chlorine chemical plants, cement plants, and coal-fired power plants. Power plants are the largest source, emitting around 50 tons of mercury pollution annually. Cement plants are the fourth largest emitter of airborne mercury in the United States, and facilities that recycle auto scrap are another big source of mercury pollution, historically pouring 10 to 12 tons of mercury into the air every year. Chlorine plants, which use massive quantities of mercury to extract chlorine from salt, "lose" mercury when mercury volatilizes during maintenance and other operational activities. The most common way Americans are exposed to mercury is through tuna fish.