Physorg.com - Commercial ships spew half as much particulate pollution as world's cars
Commercial ships give off both carbon dioxide and particulate pollution, half of which are sulfates and the other half are 'organic compounds' and black, sooty carbon. The sulfate emissions are capped under global trade agreements, but the soot isn't. Vessels with lower sulfate emissions also emit less soot, but what they do emit stays in the air longer than the soot the higher-emitting sulfate engines put out. Particulate pollution has been linked to premature deaths in coastal populations, making this a health issue since it is reported that 70% of shipping takes place within 250 miles of a coast.
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