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）。

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He induced skin cancer in mice with soot extracts.

他用煤烟提取物诱发了小鼠皮肤癌。

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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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Campaigners worry that incinerators produce dioxins (a highly toxic family of chemicals that can cause cancer and birth defects) and tiny particles of soot (also carcinogenic).

ECONOMIST: Tough landfill targets prompt a return to flaming rubbish

The EPA last year issued the first-ever standards to control smog- and soot-forming gases from gas wells site, and updated existing rules to reduce cancer-causing pollution, such as benzene, from other equipment.

NPR: Report: Flaws In EPA Drilling Pollution Data