LLM Group 6 Environment and Legal Order Prevention and Control of Pollution 2025-26 Question Paper with Solutions

For full marks, cover: the question has three limbs and the marks are spread across all of them. Define the term properly, which means quoting the three statutory definitions and showing the elements they share, not offering a dictionary line. Classify the kinds by the medium that receives the pollutant and name the law that governs each. Then take the effects on the environment medium by medium, with at least three decided cases in which a court found those effects as facts. Close on where the definitions leave gaps.

The word, and why the law could not borrow its ordinary meaning

In ordinary speech pollution means making something dirty or impure. That meaning is too wide to be law. Every river carries dissolved minerals, every breath of air carries dust, and rain itself is mildly acidic. A rule forbidding the presence of harmful matter in water would forbid water. The law therefore had to build a definition around a threshold: a substance becomes pollution only when it is present in a quantity, and in a place, where it is or is likely to be injurious.

Air. Section 2(a) of the Air (Prevention and Control of Pollution) Act, 1981 defines an air pollutant as any solid, liquid or gaseous substance, including noise, present in the atmosphere in such concentration as may be or tend to be injurious to human beings, other living creatures, plants, property or environment. Section 2(b) then defines air pollution simply as the presence in the atmosphere of any air pollutant.

Environment. The Environment (Protection) Act, 1986 defines environment in section 2(a) to include water, air and land and the inter-relationship among them and with human beings, other living creatures, plants, micro-organisms and property. An environmental pollutant under section 2(b) is any substance present in such concentration as may be, or tend to be, injurious to environment, and environmental pollution under section 2(c) is its presence in the environment.

The receiving medium. The agent must be in water, in the atmosphere or on land. The Water Act widens the medium through its definition of stream in section 2(j), which includes a water course whether flowing or for the time being dry, inland water, sub-terranean waters and notified tidal waters.

The threshold. This is the element that carries the weight. The Environment (Protection) Act and the Air Act both speak of a concentration that "may be, or tend to be, injurious". Below that concentration the same substance in the same medium is not pollution. That is why Indian pollution law is built on notified numerical standards and on consents that permit discharge within them.

Likely rather than proved harm. The definitions work on the likelihood of injury. The Water Act says "is likely to". A regulator need not wait for fish to die before acting, which is the statutory root of the precautionary approach later recognised by the Supreme Court in Vellore Citizens Welfare Forum v. Union of India, (1996) 5 SCC 647.

Air pollution is measured against the National Ambient Air Quality Standards notified by the Central Pollution Control Board on 18 November 2009 for twelve pollutants. Water pollution reaches aquifers too, because the Water Act's definition of stream includes sub-terranean waters. Land has no Act of its own and is reached through the 1986 Act and the rules made under it, most recently the Environment Protection (Management of Contaminated Sites) Rules, 2025. Noise is regulated as an air pollutant and under the Noise Pollution (Regulation and Control) Rules, 2000, notified as S.O. 123(E) on 14 February 2000.

Thermal pollution is caught by the Water Act because a change of temperature alters a physical property of water, and section 25(4) lets the Board impose conditions as to the temperature of an effluent. Radioactive pollution sits outside the pollution Acts altogether: section 16 of the Atomic Energy Act, 1962 lets the Central Government prohibit the possession, use and disposal of radioactive substances without its consent, and section 17(1)(b) provides for rules securing the safe disposal of radioactive waste. New streams of plastic, electronic and battery waste are governed by the Plastic Waste Management Rules, 2016 as amended, the E-Waste (Management) Rules, 2022 and the Battery Waste Management Rules, 2022.

The effect on the built environment is shown by M.C. Mehta v. Union of India (the Taj Trapezium case), (1997) 2 SCC 353, decided on 30 December 1996. The petition concerned damage to the marble of the Taj Mahal from air pollution in the Agra and Mathura region. The record showed suspended particulate matter at the monument regularly above 200 micrograms per cubic metre against a standard of 100 for a sensitive location. Applying the precautionary and polluter pays principles, the Court directed the 292 industries in the Trapezium to change over to natural gas or relocate. The case matters here because it treats harm to a monument as environmental harm in its own right.

Effects on water bodies

Organic waste consumes the oxygen dissolved in water as it decomposes, and fish and other aquatic life die when the oxygen falls. Nutrients from sewage and fertiliser cause algal blooms that choke lakes, a process called eutrophication. Heavy metals and pesticides do not break down; they pass up the food chain and concentrate at each level, so the harm is felt most by predators and by people who eat fish.

Indian Council for Enviro-Legal Action v. Union of India, (1996) 3 SCC 212, decided on 13 February 1996, is the Supreme Court's fullest account of soil and aquifer damage. Chemical units at Bichhri in Udaipur district produced H acid and left its toxic iron and gypsum sludge in the open. The sludge percolated into the ground, turned the village wells dark and unfit for drinking and made the soil unfit for cultivation. A report before the Court put the cost of remediating the soil and well water at Rs 37.385 crore. The Court held the industries absolutely liable and extended the polluter pays principle to the cost of restoring the environment.

Effects on living organisms and biodiversity

Pollution reduces the variety of life as well as its quantity. Sensitive species disappear first from a polluted river or wetland, and the ecosystem that remains is simpler and less resilient. Noise disturbs the breeding and movement of birds and animals, and light and heat change the behaviour of aquatic organisms near an outfall. Because the Environment (Protection) Act defines environment to include micro-organisms and the inter-relationship between living things and the physical media, a harm to an ecosystem is environmental pollution even before any human being is affected.

Conclusion. In law pollution is not dirtiness but the presence of a substance, including noise and energy, in a receiving medium at a concentration that is or is likely to be injurious, as sections 2(e) of the Water Act, 2(a) and (b) of the Air Act and 2(b) and (c) of the Environment (Protection) Act each provide. Its kinds follow the medium it enters, and Indian law regulates each through its own instrument under the umbrella of the 1986 Act. Its effects run through the atmosphere, water, soil, living organisms and even monuments, as the Taj, Kanpur and Bichhri cases found as facts. The threshold definition makes regulation workable, but it leaves cumulative harm, soil and light largely outside the statutory net, which is why Article 21 remains the backstop.