为了创造一个有益于环保和安全的世界，每个国家都有必要定出汽车限额，并限制发放许可证的数量，以控制地区的空气污染。

In order to create an environmentally friendly and safe world, it is necessary for each country to set vehicular quotas and limit the permits in number to control regional air pollution.

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同监管和行政措施相比，以市场为基础的工具，如税收和可交易许可证制度，提供了实现环保目标的诸多优势。

In contrast to regulatory or administrative approaches, market-based instruments such as taxes and tradable permit schemes offer several advantages as a means of achieving environmental objectives.

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如须于核准时间内进行撞击式打桩工程，必须事先取得由环保署签发的建筑噪音许可证。

A valid Construction Noise permit issued by the Environmental Protection Department is required for the carrying out of percussive piling during the permitted hours.

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