美国海洋及大气管理局在最近的一项研究中发现，使用低含硫量燃料可以减少百分之90的有害废气。
A recent study by the National Oceanic and Atmospheric Administration (NOAA) found that using this type of fuel reduced harmful emissions by as much as 90 percent.
为了清洁空气，加利福尼亚规定所有船只，在驶进距离岸边44公里范围内时，必须使用低含硫量燃料。美国各州中只有加州是这么规定的。
To clean up the air, California is the only state in the U.S. to require all ships to use low-sulfur fuel when they are within 44 kilometers of the shore.
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