"In one severe dust storm in 1998, particle pollution levels in Oregon, Washington and British Columbia soared. In Seattle, air-quality officials could not identify a local source of the pollution, but measurements showed that 75 per cent of it came from China.
"A larger fraction of the haze we see is Asian, far more than we ever dreamed," said Tom Cahill, professor of atmospheric science and physics at the University of California, Davis."
I read somewhere that in China, illegal and unauthorized coal plants built by municipalities and factories are coming on line at a rate of 1 a week.