A thin veil of haze hangs over much of eastern China as Typhoon Megi moves up the coast towards Korea in the above image, captured by the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite on August 18, 2004. The haze, which might otherwise have been blown out over the Pacific Ocean, has been stuck over eastern Asia, hemmed in place by Typhoon Megi. Hong Kong, shown in the lower left corner of the image, issued a health alert on August 17 and 18 as air pollution levels soared into the “very high” category. For another example of how tropical storms can affect air quality, see A New Idea in Air Quality Monitoring.