One of the elements present in varying quantities in coal and fuel oil (residual oil) which contributes to environmental degradation when coal or oil is burned. In terms of sulfur content by weight, coal is generally classified as low (less than or equal to 1 percent), medium (greater than 1 percent and less than or equal to 3 percent), and high (greater than 3.per.cent). Sulfur content is measured as a percent by weight of coal on an “as received” or a “dry” (moisture-free, usually part of a laboratory analysis) basis.
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