Chris Buckley, Shipping a Serious, but Overlooked, Source of China’s Pollution, Report Says. New York Times, Oct 28, 2014 (blog)
sinosphere.blogs.nytimes.com/2014/10/28/chinese-ships-are-serious-but-overlooked-source-of-pollution-report-says/
(“a new report [released Tuesday, Oct 28] from the Natural Resources Defense Council, a United States-based environmental advocacy group[:] Except when they approach and dock at ports that require cleaner fuel, such as in the United States or Europe, oceangoing ships plying trade through Chinese ports usually use cheap “bunker” oil, a grade of fuel that is heavy in sulfur and leaves a dense trail of fine soot, ozone and nitrogen- and sulfur-based pollutants”)