At the other end of the list are cities in Canada and the United States, which benefit from lower population density, favorable climates and stricter air pollution regulation.

污染最轻的是美国和加拿大的城市，原因是它们的人口密度低，气候怡人，并且空气污染管理规定非常严格。

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Their explosive development has posed all sorts of challenges, both in terms of regulation and pollution.

其飞速发展带来了各种挑战，包括管理方面的挑战，也包括污染方面的挑战。

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If disinfection is taken to cut off the transmission and the regulation is strict, the pollution can be prevented and the quality of the stored water can be ensured.

如果采取消毒措施，切断传播途径，严格管理制度，可以防止真菌污染，确保储水的卫生质量。

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The debate over air pollution and, more specifically, the regulation of air pollution, raged on this week as the Environmental Protection Agency (EPA) watered down its cross-state pollution rule and House Republicans moved to delay new rules on toxic air pollution from cement plants, solid waste incinerators, and industrial boilers.

FORBES: Two New Reasons to Worry about Air Pollution: Obesity and Diabetes

Increasingly, health research seems to be pointing to a need for stricter regulation of air pollution.

FORBES: Two New Reasons to Worry about Air Pollution: Obesity and Diabetes

When viewed through the public health lens, the economic arguments against regulation of air pollution begin to unravel, particularly in the face of rising healthcare costs.

FORBES: Two New Reasons to Worry about Air Pollution: Obesity and Diabetes