Acid precipitation, climate change and deteriorating air quality are some of the major environmental concerns of today, all caused by anthropogenic emissions of sulfur dioxide (SO₂), carbon dioxide (CO₂), hydrocarbons, nitrous oxide (N₂O), nitrogen oxides (NO_x), mercury and others. Societies have designed coping strategies by reducing specific emissions, depending on the environmental concerns of the times. The regulatory and management approaches for the different environmental issues have been formulated at different times. For example, acid precipitation was addressed as an environmental problem well before the anthropogenic climate change. In some countries, air-quality deterioration has been identified as an urgent problem only recently. Because of these reasons, there is incoherence in regulatory strategies and policies.

中文翻译：

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一个平衡问题：权衡控制氨、二氧化硫和氮氧化物的选项

酸性降水、气候变化和空气质量恶化是当今一些主要的环境问题，所有这些都是由二氧化硫 (SO ₂ )、二氧化碳 (CO ₂ )、碳氢化合物、一氧化二氮 (N ₂ O)、氮的人为排放引起的氧化物（NO _x)、汞等。社会根据时代对环境的关注，通过减少特定排放量来设计应对策略。针对不同环境问题的监管和管理方法已在不同时期制定。例如，酸性降水早在人为气候变化之前就被视为一个环境问题。在一些国家，空气质量恶化直到最近才被确定为一个紧迫的问题。由于这些原因，监管战略和政策存在不一致。