China's heavy metals pollution falls on U.S. soil

And it's not just the air that ends up contaminated from China's enormous number of coal plants. Coal combustion is the world's second-largest source of mercury contamination, just barely surpassing small-scale gold mining. And although mercury eventually settles out of the air, it can remain airborne long enough to cross the Pacific Ocean and contaminate wilderness, farmland and urban areas across the western United States.
http://www.naturalnews.com/044291_heavy_metal_pollution_china_us_soil.html