New research suggests that cyclists are at increased risk of lung damage because of soot.
新的研究表明，骑自行车者正因煤烟处于与日俱增的肺损伤危机之中。
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But the new cleaner fuel has come on stream just as regulators are clamping down on emissions of smog-causing nitrous oxides and soot-like particulates, which have been linked to lung cancer.