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。
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.
不过这种更干净的燃料一直没能投入生产，直到决策者们决定限制一氧化碳和灰尘微粒的排放量（它们是有害烟雾的主要来源，煤尘微粒则与肺癌有联系）。
Objective To study the relation between pollution of soot and female lung cancer.
目的研究煤烟污染与女性肺癌的关系。
Objective To study the relation between pollution of soot and female lung cancer.
目的研究煤烟污染与女性肺癌的关系。
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