Further, as an illustration of Iran's febrile mood, many Iranians blame a recent lethal rise in air pollution on the allegedly low quality of indigenous fuel.

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Moreover, much of the coal he bought from Burlington is low-quality lignite, a brownish fuel one step removed from peat, which can't be transported because it tends to spontaneously combust.

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The reactor, according to Petrobras, was built with technology to produce oil with low sulfur content, respecting the new environmental standards on fuel quality.

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