Which US environmental policy is primarily focused on improving air quality and reducing pollutants?

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Air quality improvement is the focus here. This policy is built to reduce pollutants and protect air quality by setting limits on how much of certain contaminants can be in the outside air and by controlling where and how those pollutants can be emitted. It establishes National Ambient Air Quality Standards for pollutants such as particulate matter, ozone, sulfur dioxide, nitrogen oxides, carbon monoxide, and lead, and it requires states to develop plans to meet those standards. It also tightens emissions from major sources, including engines, factories, and other facilities, through technology-based and performance-based requirements and permitting. This combination of ambient standards and emission controls directly targets the pollutants that degrade air quality.

Other policies mentioned have different primary targets: one focuses on pollution in water bodies and protecting aquatic ecosystems and drinking water quality; another requires federal agencies to assess environmental impacts of their actions; and another protects endangered species and their habitats.