Candidates preparing for UPSC should be knowledgeable about several key environmental policies like the National Biodiversity Action Plan, National Clean Air Programme, and Swachh Bharat Mission. These policies address critical issues such as pollution, waste management, and sustainable development. Understanding the objectives, implementation strategies, and challenges of these initiatives equips aspirants with the necessary insights to handle related questions effectively. Moreover, awareness of international environmental agreements adds depth to their responses in both written exams and interviews.