41 4 2009-07-02T14:05:12-07:00 Large ships '” from cargo vessels to oil tankers to cruise liners '” are major polluters because they burn heavy bunker fuel. They must burn cleaner fuel near California ports now. false 3854 Tough new smog rules take effect for ships http://www.mercurynews.com/california/ci_12744198?source=rss tough-new-smog-rules-take-effect-for-ships 2009-07-02T14:05:12-07:00