DENVER (AP) - A dust storm that started in Mongolia and picked up industrial pollution from China has spread a haze across a quarter of the mainland United States, experts said Tuesday. [...]

In late 1998, scientists claimed to have documented the spread of industrial pollution from China to the United States, where it caused pollution levels as high as two-thirds of federal health limits.

Science News Online (12/12/98): Asian pollution drifts over North America <www.sciencenews.org>

"This storm is a godsend to pollution researchers,"

"People are finally realizing that what have been saying for years is true. Pollution from Asia is being carried across the oceans."