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Subject: Conservation & Mitigation

1. Conservation Progs.
2. Worldwide initiatives
3. Mitigation Strategies
4. Conventions and Protocols

  • Why pollution affects north Indian cities more than south and west

    Introduction

    Over 2015-2025, no northern Indian city recorded “safe” air quality even once, with Delhi emerging as the most polluted city. In contrast, cities in the south and west maintained comparatively better AQI levels. This consistent divergence reflects entrenched geographical, meteorological, and structural constraints that trap pollutants in the Indo-Gangetic Plain while aiding dispersion along the coasts.

    Why in the news

    A new assessment titled Air Quality Assessment of Major Indian Cities (2015-2025) reported that Delhi continues to be the most polluted city, with AQI stagnating at unhealthy levels. The study shows sharp regional contrasts, revealing that only southern and western cities showed sustained air quality improvements, making this a significant environmental governance concern.

    Persistent Regional Air Quality Divide

    Why northern cities remain severely polluted

    1. Consistent high pollution: Northern cities experienced prolonged severe pollution episodes across the decade.
    2. Limited “healthy days”: None recorded AQI within safe thresholds in 2025.
    3. Stagnant improvement: Even when AQI dipped (e.g., 2019), levels remained far above healthy limits.

    How southern and western cities compare

    1. Cleaner AQI bands: Chennai, Chandigarh, Visakhapatnam, and Mumbai maintained AQI between 80-140.
    2. Steady progress: These cities displayed clear improvements between 2015-2025.
    3. Best performer: Bengaluru recorded the best AQI among all 11 cities.

    Why Delhi Emerges as the Worst Performer

    Data trends

    1. Peak AQI: Delhi saw its worst AQI in 2016 (over 250).
    2. Temporary dips: AQI improved in 2019 but did not meet healthy standards.
    3. Current status: AQI stagnated at 180.5 in 2025, indicating persistent failure to achieve safe limits.

    Structural challenges

    1. Urban surface roughness: Dense built-up surfaces inhibit wind flows and pollutant dispersion.
    2. Trapping effect: Reduced ventilation leads to prolonged retention of pollutants.

    Why Secondary Northern Cities Remain Highly Polluted

    Cities in focus: Lucknow, Varanasi, Ahmedabad, and Pune showed:

    1. Prolonged elevated AQI: Frequent high pollution days with slow improvement.
    2. Mixed progress: Improvements after 2019, but still above healthy limits.
    3. Heavy pollutant load: Emissions + weak dispersion exacerbate poor quality.

    Why Southern & Western Cities Perform Better

    1. Favourable winds: Sea breezes in coastal cities aid pollutant dispersal.
    2. Better atmospheric ventilation: Stronger monsoon winds and less winter stagnation.
    3. Urban characteristics: Less surface roughness compared to Delhi’s dense built-up terrain.

    Outcome

    1. Improved AQI stability
    2. Lower incidence of sharp pollution spikes

    Geography and Winter Inversion: The Deciding Factors

    Geographical lock-in

    1. Indo-Gangetic Basin: Landlocked region bounded by the Himalayas prevents outflow of pollutants.
    2. Pollutant entrapment: Cold northern boundary and flat terrain acts like a “pollution bowl”.

    Winter inversion

    1. Temperature inversion effect: Warm air traps cold, dense air near the surface and this leads to pollutants settling close to ground level.
    2. Seasonal peak: December-February shows intensified pollution due to reduced boundary layer height.

    Built environment factor

    1. Surface roughness: Urban canyons in Delhi slow wind speed, increasing stagnation.

    Seasonal Wind Patterns and Air Dispersion

    Why southern/western cities improve during monsoon

    1. Strong monsoon flows disperse pollutants effectively.
    2. Regular ventilation cycles prevent accumulation.

    Why northern cities worsen in winter

    1. Weak westerly winds
    2. Lower atmospheric mixing height
    3. Persistent fog, cold air trapping, and stagnation

    Conclusion

    The decade-long air quality analysis underscores a structural, region-specific pollution challenge rooted in geography, climate, and urban form. Northern cities, especially those in the Indo-Gangetic Basin, remain trapped in severe winter pollution cycles, while southern and western cities benefit from favourable winds and dispersion conditions. Any meaningful pollution mitigation strategy must therefore be region-sensitive and climatologically informed.

    PYQ Relevance

    [UPSC 2021] Describe the key points of the revised Global Air Quality Guidelines (AQGs) released by the World Health Organisation (WHO). How are these different from its last update in 2005? What changes in India’s National Clean Air Programme are required to achieve these revised standards?

    Linkage: This topic is important for UPSC as it highlights India’s deep regional air-quality disparities and the structural limits of current pollution-control policies. It links directly to GS-3 themes of air pollution, WHO AQGs, NCAP reforms, and the recurring winter inversion-driven smog episodes in north Indian cities.

  • Why does India need bioremidiation

    Introduction

    Bioremediation uses microorganisms such as bacteria, fungi, algae, and plants to break down toxic pollutants like pesticides, plastics, heavy metals, and industrial chemicals into harmless by-products. With India experiencing severe air, water, and soil contamination, bioremediation provides a scalable and sustainable pathway to clean ecosystems. At the same time it will  generate opportunities in biotechnology and environmental consulting.

    What Is Driving India Toward Bioremediation?

    1. Rapid industrialisation: Intensifies contamination of air, water, and land, increasing demand for cost-effective clean-up solutions.
    2. High pollution load: Rivers continue to receive sewage and industrial effluents daily, causing persistent ecological and health risks.
    3. Limitations of traditional clean-up: Conventional methods are expensive, energy-intensive, and often shift pollutants to secondary waste streams.
    4. Biological advantage: Indigenous and extremophile microbes adapted to local temperatures, salinity, and soil conditions perform better than imported strains.

    How Do Different Types of Bioremediation Work?

    1. In situ bioremediation: Direct treatment at the contaminated site (e.g., bacteria sprayed on oil spills or contaminated soil treated on location).
    2. Ex situ bioremediation: Removal and controlled treatment of polluted soil or water in bioreactors or treatment facilities before returning it.
    3. Combination with biotechnology: Genetically modified microbes designed to degrade complex pollutants like plastics or toxins offer enhanced efficiency.

    How Is India Using Bioremediation Today?

    1. Government-supported pilot projects: DBT supports several programmes through its Clean Technology Programme, linking universities, research institutions, and industries.
    2. CSIR-National Environmental Engineering Research Institute initiatives: Mandate to develop and implement bioremediation solutions; contributes to policymaking.
    3. Indian Institute of Technology experiments: Development of microbial synthesised compounds to mop up oil spills and identify bacteria suitable for soil restoration.
    4. Emerging startups: Firms like Biotech Consortium India Limited (BCIL) and Ecominr India offer soil and water microbial solutions.

    What Are Other Countries Doing?

    1. Japan: Integrates microbial and plant-based systems into municipal solid waste strategy.
    2. European Union: Funds cross-country projects to remove toxins, clean up oil spills, and restore mining sites.
    3. China: Makes bioremediation a priority under soil pollution control frameworks and uses genetically improved bacteria for industrial waste.

    What Are the Risks and Challenges?

    1. Environmental risks: Introduction of genetically modified organisms must be strictly monitored to prevent unintended ecological effects.
    2. Lack of unified standards: Absence of national bioremediation protocols, biosafety guidelines, certification systems.
    3. Knowledge and skill gaps: Limited trained personnel, weak microbial testing frameworks, and poor site assessment capacity.
    4. Public scepticism: Low awareness about microbes as environmental allies may slow adoption.

    What Should India Do Next?

    1. Standard-development: Develop national protocols for microbial applications and bioremediation safety.
    2. Regional bioremediation hubs: Link universities, startups, and industries for field testing and faster scale-up.
    3. Government integration: Align bioremediation with Namami Gange, Swachh Bharat Mission, and industrial clean-up mandates.
    4. Public engagement: Raise awareness about biological solutions to restore trust in microbial technologies.

    Conclusion

    Bioremediation presents India with a scalable, sustainable, and scientifically grounded pathway to address its massive environmental burdens. While global examples offer templates for success, India must create strong regulatory frameworks, biosafety standards, and capacity-building ecosystems. Integrating microbes with national missions and industrial compliances can transform bioremediation from pilot projects into mainstream environmental governance.

    PYQ Relevance

    [UPSC 2018] What are the impediments in disposing of the huge quantities of discarded solid wastes which are continuously being generated? How do we remove safely the toxic wastes that have been accumulating in our habitable environment?

    Linkage: This PYQ is highly relevant as it falls under GS3 pollution, waste management, and sustainable clean-up. The article links directly by showing how microbial systems overcome traditional waste-disposal barriers and safely break down toxic, accumulated solid waste.

  • Svalbard

     Why in the News?

    • Scientists recently observed an unexpected large gathering of walruses on the remote shores of Svalbard, indicating shifting wildlife behaviour in the Arctic due to changing climatic conditions.

    About Svalbard 

    Location

    • A Norwegian archipelago in the Arctic Ocean.
    • Lies between mainland Norway and the North Pole (about halfway).
    • Northernmost permanent human settlement in the world.

    Discovery & Status

    • Discovered by Willem Barentsz (Dutch explorer) in 1596.
    • Svalbard Treaty (1920) → established Norwegian sovereignty.

    Geography

    • ~60% glacier-covered; marked by mountains, fjords.
    • Surrounding seas:
      • Arctic Ocean, Greenland Sea, Norwegian Sea.
    Consider the following countries: (2014)

    1. Denmark 

    2. Japan 

    3. Russian Federation 

    4. United Kingdom 

    5. United States of America 

    Which of the above are the members of the ‘Arctic Council’? 

    (a) 1, 2 and 3 only (b) 2, 3 and 4 only (c) 1, 4 and 5 only (d) 1, 3 and 5 only

  • Khiamniungan Tribe

    Why in the News?

    • The Prime Minister of India recently mentioned the Khiamniungan tribe of Nagaland in his Mann Ki Baat episode, highlighting their traditional practice of cliff-honey hunting and rich cultural heritage.

    About the Khiamniungan Tribe

    • One of the major Naga tribes inhabiting both:
      • Eastern Nagaland (India)
      • North-Western Myanmar
    • Their homeland lies along the Indo-Myanmar border.
    • The term “Khiamniungan” means “source of great water/river”.
    • Language: Khiamniugan, a Sino-Tibetan Naga language.
    • Social Structure: Traditionally based on a clan system.

    Festivals

    • Tsokum Sumai: Celebrated in September–early October.
      • Purpose: Invoke blessings for a rich harvest.
    • Khaotzao Sey Hok-ah Sumai: Marks the end of agricultural activities for the year.

    Economy & Livelihood

    • Agriculture is the primary occupation.
    • Traditionally practiced jhum cultivation.
    • Renowned for cliff-honey hunting, practiced for centuries.
    Consider the following pairs: Tribe State (2013)

    (1). Limboo (Limbu) : Sikkim 

    (2). Karbi : Himachal Pradesh 

    (3). Dongaria Kondh : Odisha 

    (4). Bonda : Tamil Nadu 

    Which of the above pairs are correctly matched? 

    (a) 1 and 3 only 

    (b) 2 and 4 only 

    (c) 1, 3 and 4 only 

    (d) 1, 2, 3 and 4

  • New Species of ‘Shadow’ Damselfly Discovered in Kodagu’s Western Ghats 

    Why in the News?

    A new damselfly species, Protosticta sooryaprakashi, commonly called the Kodagu Shadowdamsel, has been discovered in the Western Ghats, Karnataka. The finding underscores the rich but still understudied biodiversity of the region.

    Species Details

    • Common Name: Kodagu Shadowdamsel
    • Scientific Name: Protosticta sooryaprakashi
    • Family: Platystictidae (Shadowdamsels)

    Discovery Location

    • Found along the Sampaje River banks (Kodagu District)
    • Also observed in Agumbe high-altitude forests
    • Habitat: Shaded, riparian vegetation in the Western Ghats

    Distinctive Features

    • Males show a sky-blue marking on the prothorax (behind the head).
    • Body: Dark brown to black, unlike the crimson thorax of the related Protosticta sanguinostigma.
    • Unique genital ligula: Tip shaped like a duck’s head (important taxonomic marker).
    • Smaller, more delicate, with weak fluttering flight.
    In which of the following states is the lion-tailed macaque found in its natural habitat? (2013)

    1. Tamil Nadu 

    2. Kerala 

    3. Karnataka 

    4. Andhra Pradesh 

    Select the correct answer using the codes given below. 

    (a) 1, 2 and 3 only (b) 2 only (c) 1, 3 and 4 only (d) 1, 2, and 3

  • Rustic Bunting Spotted in NCR for the First Time

    Why in the News?

    A Rustic Bunting (Emberiza rustica) — a rare migratory passerine bird — was spotted for the first time in the National Capital Region (NCR) at Najafgarh Jheel (Delhi–Gurugram border) on 28 November 2025.

    About Rustic Bunting (Emberiza rustica)

    General Features

    • Passerine bird, slightly larger than a sparrow.
    • Distinctive markings:
      • Males: black head + reddish breast band
      • Females: reddish flank streaks

    Breeding Range

    • Breeds across the northern Palearctic region.
    • Prefers wet coniferous woodlands.

    Migration Pattern

    • Winters in SE Asia & East Asia (Japan, Korea, eastern China).
    • Shows altitudinal migration.
    • Extremely rare visitor to India; usually recorded only in:
      • Northeast India
      • Himalayan belt (Ladakh, Kashmir, Arunachal Pradesh)

    Status in India

      • Very few sightings historically: Ladakh (2023, 2024), Arunachal Pradesh (2025), Kashmir (2022) and Jammu & Kashmir’s Kangan (2022 — fifth record for India).
    • First Ever Record for Delhi NCR
      • Sighted at Najafgarh Jheel, confirming its first occurrence within a 100 sq km NCR radius.

    IUCN Status

    • 2025 IUCN Red List:
      • Status changed from Vulnerable → Near Threatened
      • Reason: Decline has slowed down over the last decade.
    Consider the following: (2014)

    1. Bats

    2. Bears

    3. Rodents

    The phenomenon of hibernation can be observed in which of the above kinds of animals?

    (a) 1 and 2 only (b) 2 only (c) 1, 2 and 3 only (d) Hibernation cannot be observed in any of the above

  • SC ruling on post-facto clearances sets environmental law back by decades

    Introduction

    The Environmental Impact Assessment (EIA) is a preventive system requiring environmental clearance before a project begins. In 2025, the Supreme Court’s Vanashakti judgment banned all post-facto clearances as unconstitutional. In a new 2:1 ruling, the Court has now recalled that decision, warning that continuing the ban would cause “devastating” consequences and jeopardise major public investments. This marks a clear shift away from earlier strictures on environmental approvals.

    Why in the news?

    The Supreme Court’s recent endorsement of post-facto environmental clearances marks a sharp break from earlier rulings where such permissions were held illegal. For the first time, industries operating without prior approval may regularise their violations by paying penalties. This undermines the preventive purpose of Environmental Impact Assessments (EIAs), weakens compliance in a country already facing severe pollution challenges. The ruling enables violators to bypass mandatory safeguards like public hearings and ecological assessments, allowing large-scale industries to operate first and seek approval later.

    Understanding Ex Post Facto Environmental Clearances

    Meaning and Basic Idea

    • Retrospective approvals: Permissions granted after a project has already started construction, expansion, or operation without the mandatory prior Environmental Clearance (EC).
    • Departure from preventive logic: Converts a forward-looking safeguard into a mechanism to regularise completed violations.

    Intended Purpose: Rare exceptions: Initially justified only for unusual situations where procedural lapses occurred without deliberate violation.

    Actual Use: Regularisation tool: Gradually used to “legalise” ongoing or completed activities that had bypassed due environmental scrutiny.

    Legal Context

    1. EPA, 1986 as foundation: The Environment (Protection) Act establishes prior approval as the norm for activities affecting the environment.
    2. EIA 1994 & 2006 notifications: Both frameworks emphasise that major projects, industrial, mining, construction, must undergo assessment before commencement.

    Supreme Court’s Stand in the Vanashakti Judgment (2025)

    Key Findings

    1. Invalidation of government provisions: Struck down specific notifications and office memoranda that enabled retrospective clearances.
    2. Violation of environmental principles: Held that such clearances contradict the precautionary principle, which seeks to prevent harm at the outset.

    Judicial Observations

    1. Labelled as serious illegality: The Court stated that post-facto approvals erode environmental rule of law.
    2. Restriction on future permissions: Directed that no further mechanisms be created to enable or replicate retrospective ECs. 

    How Does the Ruling Change India’s Environmental Safeguards?

    1. Shift from Prevention to Regularisation: India’s environmental law is built on prior approval, but the ruling legitimises post-violation approvals. This weakens deterrence and changes the core architecture of environmental governance.
    2. Dilution of Public Hearings: Many industrial activities will now bypass public consultations, one of the most important safeguards under the EIA process.
    3. Weakening of the No-Fault Liability Principle: Earlier, industries operating without clearance faced closure; now they may continue operating after paying monetary penalties.
    4. Increased Environmental Risk: Projects threatening forests, rivers, and air quality gain legal pathways to operate retrospectively, exacerbating existing ecological crises.

    How Has Policy Drift in Recent Years Enabled Post-Facto Approvals?

    1. Draft EIA Notification 2020: Attempted to institutionalise post-facto approvals and reduce public participation, an approach the ruling now indirectly validates.
    2. Forest Conservation Act Amendments (2023): Redefined “forests” to exclude large tracts of land, enabling diversion without scrutiny and bypassing earlier safeguards.
    3. Coastal Regulation Zone (CRZ) Dilution (2018): Relaxed no-development zones and allowed extensive construction in vulnerable coastal areas.
    4. Expansion of Exemptions: Over 45 industrial categories have been exempted from prior clearances in the past decade.
    5. Legalisation of Violations: Historical decisions like TN Godavaraman protected forests strictly, but recent changes enable easier diversion and commercial use.

    Why Is the Ruling Especially Concerning for India’s Current Environmental Crisis?

    1. Extreme Pollution Levels: With 83 of the world’s 100 most polluted cities in India, any weakening of safeguards directly harms public health.
    2. Children’s Health Impact: Delhi’s children lose up to 10 years of lung function, highlighting the urgency of strict compliance.
    3. Carcinogenic Exposure: Farmers in Punjab and Haryana inhale toxic particulates every winter, worsening respiratory health.
    4. Hospital Overload: Urban hospitals deal with chronic respiratory disease surges every winter.
    5. Climate-Driven Disasters: Cyclones, erosion, and floods already strain ecosystems; weaker laws increase vulnerability.

    How Does the Ruling Affect Democratic Accountability?

    1. Reduced Public Participation: By enabling post-facto approvals, the ruling sidelines communities, especially those in pollution-affected regions.
    2. Bypassing Transparency: Industries may avoid public hearings and statutory scrutiny.
    3. Weakening of Citizen Rights: The apex court’s earlier stance held the environment as part of Article 21’s right to life; this shift undermines that framework.
    4. Centralisation of Power: State-level mechanisms become redundant if industries secure clearances retrospectively.

    What Long-Term Risks Does the Judgment Create?

    1. Systematic Legal Erosion: A decade-long pattern of exempting industries and diluting norms is now legitimised judicially.
    2. Encouragement of Violations: Industries may prefer paying a penalty over compliance, cheaper and faster.
    3. Increased Ecological Degradation: Forests, rivers, coasts, and air quality may deteriorate further due to weakened oversight.
    4. Regulatory Capture: Industries gain disproportionate influence over environmental decision-making.
    5. Undermining Global Climate Commitments: India’s commitments under the Paris Agreement require stronger, not weaker, compliance frameworks.

    Conclusion

    The Supreme Court’s endorsement of post-facto clearances marks a turning point in India’s environmental jurisprudence. While the ruling attempts to balance economic development and compliance, it risks normalising illegality and weakening safeguards that exist to protect public health, ecological integrity, and constitutional rights. At a time of worsening pollution and climate vulnerability, India needs stronger, not diluted, environmental governance.

    PYQ Relevance

    [UPSC 2014] What role do environmental NGOs and activists play in influencing Environmental Impact Assessment (EIA) outcomes for major projects in India? Cite four examples with all important details.

    Linkage: With post-facto clearances weakening formal EIA safeguards, NGOs become vital watchdogs ensuring accountability. This topic links directly to environmental governance, EIA dilution, and current judicial-policy debates.

  • Hawfinch Sighting in Jim Corbett National Park  

    Why in the news?

    • A Hawfinch (Coccothraustes coccothraustes), a bird species native to Europe, North Africa, and temperate Asia, was recorded on 23 November in the Dhela zone of Jim Corbett National Park, Uttarakhand. This is considered a vagrant bird sighting.

    About Hawfinch (Coccothraustes coccothraustes)

    • Family: Fringillidae (Finches)
    • Size: ~18 cm
    • Wingspan: 29–33 cm
    • Distinctive Feature: Very powerful, heavy bill capable of cracking extremely hard seeds/nuts.
    • Plumage: Males and females similar; males slightly darker.

    Native Range

    • Europe and North Africa
    • Temperate Asia, including:
      • Mongolia and Kazakhstan
    • Not native to India.

    Status in India

    • Sighting classified as a vagrant record—bird appears outside its usual distribution range.
    • Only two previous records in the Indian subcontinent:
      • Muzaffarabad (1908) – PoK
      • Aliabad (2017) – PoK
    • This is one of the very few confirmed sightings.
    Why is a plant called Prosopis juliflora often mentioned in the news? (2018) 

    (a) Its extract is widely used in cosmetics. 

    (b) It tends to reduce the biodiversity in the area in which it grows

    (c) Its extract is used in the synthesis of pesticides

    (d) None of the above

    This question tests the critical concept of non-native or exotic species impacting biodiversity, which is the implicit environmental concern raised by the Hawfinch sighting.

  • Ningaloo Reef Mass Coral Mortality 

    Why in the News?

    A new survey in 2025 shows that nearly 70% of corals in Australia’s UNESCO World Heritage–listed Ningaloo Reef have died due to the most intense and prolonged marine heatwave on record.

    About Ningaloo Reef  

    • Located in Western Australia.
    • A UNESCO World Heritage Site.
    • One of the largest fringing reefs in the world (~260 km long).
    • Important for marine biodiversity, supporting whale sharks, turtles, reef sharks, and diverse coral species.

    Extent of Coral Mortality

    • ~70% mortality recorded in latest survey.
    • In eight northern lagoon sites (Osprey → Tantabiddi Sanctuary Zones), mortality >60%.
    • Of 1,600+ corals assessed in March, only ~600 survived by October.

    Species Impact

    • Highly Affected (Dominant Species Lost)

        • Staghorn corals: Acropora tenuis, Acropora millepora and Acropora spicifera
        • Thin birdsnest coral (Seriatopora hystrix).
    • Relatively Resilient

      • Veron’s tube coral (Echinopora ashmorensis)
      • Lesser knob coral (Cyphastrea microphthalma)
    • Structural decline:
      • Dead corals now overgrown by sponges, turf algae, reducing reef stability & biodiversity.

    Broader Ecological Significance

    • Coral reefs support ~1/3 of global marine species.
    • Mass mortality compromises: Fish breeding grounds, Shelter for marine organisms, Coastal protection and Tourism & local economies.

    Widespread Global Coral Stress

    According to the United States National Oceanic and Atmospheric Administration (NOAA):

    • 84.4% of the world’s reef areas experienced bleaching-level heat stress (Jan 2023–Sept 2025).
    • Mass bleaching in 83+ countries.
    • Marine heatwaves in 2023 lasted 4× longer than the long-term average and affected 96% of the world’s oceans.
    The scientific view is that the increase in global temperature should not exceed 2 ∘ C above pre-industrial level. If the global temperature increases beyond 3 ∘ C above the pre-industrial level, what can be its possible impact/impacts on the world? 

    1. Terrestrial biosphere tends toward a net carbon source. 

    2. Widespread coral mortality will occur. 

    3. All the global wetlands will permanently disappear. 

    4. Cultivation of cereals will not be possible anywhere in the world. 

    Select the correct answer using the code given below: 

    (a) 1 only (b) 1 and 2 only (c) 2, 3 and 4 only (d) 1, 2, 3 and 4 only

  • Pazhayar River Pollution in Nagercoil

    Why in the News?

    • Rampant sewage discharge into the Pazhayar River in Nagercoil (Tamil Nadu), especially near Ozhuginesary, has raised serious environmental and public health concerns.
    • A 2024 situational report highlighted severe domestic, agricultural, and industrial (rubber processing) pollution in the river.
    • Nagercoil Corporation has initiated steps to seal sewage inlets, but pollution remains widespread.

    About the Pazhayar River

    • A perennial river in Kanniyakumari district, Tamil Nadu.
    • Part of the Kodhayar River Basin, covering 1,646.964 sq km.
    • Basin lies entirely within Tamil Nadu, with a small stretch in Radhapuram (Tirunelveli district).

    Biological Oxygen Demand (BOD) is a standard criterion for (2017)

    (a) Measuring oxygen levels in blood 

    (b) Computing oxygen levels in forest ecosystems 

    (c) Pollution assay in aquatic ecosystems 

    (d) Assessing oxygen levels in high altitude regions