During spring time the meteorology changes and Asian dust and pollution are carried to Hawaii. This Asian dust is lofted over China and is carried across the Pacific Ocean in the jet stream descending in surface high pressure subsidence regions and then entering the trade wind air flow. Evidence of this trans-Pacific transport is seen in the filter measurements made at the Mauna Loa observatory on the island of Hawaii. During the Kuwait oil fires, filter samples collected in Hawaii showed dramatic increases in soot loading. During and soon after the Chernoble disaster filter samples collected in Hawaii also experienced increased radioactivity
The figure above shows an Asian dust/pollution layer as it descends into the trade wind inversion. This picture was taken from the Mauna Loa observatory looking north towards the Mauna Kea mountain.