The combination of air pollution and exercise increases the potential problems.

空气污染和运动锻炼加重了潜在的问题。

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The UK-based Royal Commission on Environmental Pollution says that while the materials have so far shown no sign of being harmful, there is a "major gap" in research about their potential risks.

这份报告由英国皇家环境污染委员会完成，它说，尽管纳米材料迄今为止没有表明有害的迹象，但是对其潜在风险的研究还有“严重的欠缺”。

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Excess nitrogen and phosphorus nutrients due to large quantities of feed imports, can lead to problems with manure disposal and pose a potential pollution risk.

大量的饲料进口产生过多的氮磷营养物，将导致粪便处理的问题，并构成潜在的污染风险。

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Instead, they found high caffeine levels near Carl Washburne State Park and Cape Lookout, two areas not near the potential pollution sources, and low levels of caffeine near large population centers such as Astoria, Warrenton and Coos Bay.

CNN: Researchers find caffeine in waters off Oregon

Its impact on U.S. industry was arguably overrated given our evolution toward a service economy, but the externalities of pollution limits had the potential to be unfortunate.

FORBES: Political Economy

There has been no pollution so far but a potential danger from an oil spill remains.

BBC: Ship refloating plan launched