Environment & Ecology·Prelims Questions

Air Pollution — Prelims Questions

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Version 1Updated 9 Mar 2026

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Q1medium

Which of the following pollutants is a secondary pollutant and a major component of photochemical smog?

Q2medium

Consider the following statements regarding the National Clean Air Programme (NCAP): 1. It aims to reduce PM2.5 and PM10 concentrations by 20-30% by 2024. 2. The base year for comparison is 2017. 3. It is a legally binding program under the Environment (Protection) Act, 1986. Which of the statements given above is/are correct?

Q3easy

Which of the following constitutional provisions obligates the State to protect and improve the environment?

Q4medium

Consider the following statements regarding BS-VI emission norms: 1. They mandate a significant reduction in sulfur content in petrol and diesel fuels compared to BS-IV. 2. On-Board Diagnostics (OBD) systems are mandatory for all vehicles under BS-VI. 3. They primarily aim to reduce greenhouse gas emissions like CO2. Which of the statements given above is/are correct?

Q5easy

Which of the following international agreements is specifically designed to protect the ozone layer by phasing out ozone-depleting substances?