China's Air Pollution in Oregon!

I was at a party last night, where a guest told me about the family trip to Mt. Bachelor. She told me of meeting someone at the top who told her of discovering air pollution particles on the mountain. She was wondering how this could be, because she thought that the ocean air would have "cleaned" the air before it got to Oregon. I explained to her about upper levels of air in the atmosphere, but it got me to remembering from years ago talk of China's air pollution reaching across the Pacific.

Haven't heard much about China's air pollution reaching the US, since US trade with China has boomed.

I found this link to verify her story.
China' Air Pollution in Oregon