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Emission controls refer to the mechanisms and technologies designed to reduce harmful pollutants released into the environment as byproducts of various industrial processes, transportation systems, and energy production. These controls work to limit the amount of pollutants such as nitrogen oxides, sulfur dioxide, carbon monoxide, and particulate matter that are emitted into the air, water, and soil, in order to minimize negative impacts on human health and the ecosystem. Emission controls are crucial for maintaining air quality standards and mitigating the effects of climate change.