An "environmental assessment" developed under NEPA is best described as?

An environmental assessment developed under the National Environmental Policy Act (NEPA) is indeed characterized as a concise public document for which a Federal agency is responsible. This document is crucial in the decision-making process regarding the potential environmental impacts of proposed federal actions. It serves to inform both the public and decision-makers about the consequences of a project, ensuring that environmental factors are considered.

The assessment is designed to be accessible and straightforward, providing a balance of consideration for ecological impacts while being sufficiently brief to facilitate quick reviews and decisions. By emphasizing accountability of the Federal agency and public engagement, the NEPA process fosters transparency regarding environmental stewardship.

Other options, while related to environmental topics, do not adequately encapsulate the comprehensive and formal nature of an environmental assessment under NEPA. For example, focusing solely on specific issues like fish or acid rain limits the broader applicability of the assessment. Additionally, while addressing air pollution control is relevant, it does not represent the full scope of what an environmental assessment encompasses, which includes various environmental impacts and not just one area of concern.