Markets may view high pollution levels as evidence that a firm's operations are inefficient, and may raise concerns about financial liabilities and penalties.

市场可能把污染程度高看成是企业经营效率低的表现，可能会对其财务负债和处罚表示关注。

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WHO said the reasons for the high pollution levels varied, but that often rapid industrialization and the use of poor quality fuels for transportation and electricity generation are to blame.

世界卫生组织说，导致高污染水平的原因各有不同，不过通常是由迅速工业化及在交通和发电上使用低质量的燃料导致的。

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Thee University of Cambridge study showed that even in cities with high pollution levels, the benefits outweigh the risks.

剑桥大学的研究表明，即使在空气污染程度较高的城市，锻炼仍是利大于弊。

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It's also more likely that high pollution levels will occur because heat creates the conditions for photochemical smog.

CNN: In-Depth Specials - City Limits

Its Ohio River basin water-quality trading project will allow those facing high pollution-control costs to buy reduction credits from those whose costs are lower.

ECONOMIST: Nutrient pollution

Other concerns include potential impacts to groundwater in the event of a spill and high pollution from refineries along the Gulf Coast that would process the bitumen.

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