CDS / OTA Current Affairs · Environment · 29 Jul 2026

Microplastics & Marine Litter: A CDS/OTA Environment Explainer

By Aditya Tiwari · 29 Jul 2026 · 7 min read

On 29 July 2026, the government told Parliament that the National Centre for Coastal Research (NCCR) — under the Ministry of Earth Sciences — is monitoring microplastics, mesoplastics, macroplastics and marine litter along India's coast, including Thoothukudi and the Gulf of Mannar. Its studies find synthetic filaments the dominant microplastic type, with riverine discharge and abandoned fishing gear the main sources; the NCCR's Clean Coast Index rates those stretches "moderately clean." For a CDS/OTA aspirant, plastic pollution is a high-value environment topic.

The news in one frame

The essentials:

What: NCCR monitoring of microplastics and marine litter along India's coast.
Findings: synthetic filaments dominate; main sources = riverine discharge and ALDFG (lost fishing gear).
Tool: the Clean Coast Index (CCI) — developed by NCCR to grade coastal cleanliness.
Who: the Ministry of Earth Sciences (NCCR is based in Chennai).

What are microplastics?

Start with the definition — the heart of the topic. Microplastics are plastic particles smaller than 5 mm. They come in two forms:

Primary microplastics — manufactured small: microbeads (in some cosmetics/toothpastes), industrial pellets ("nurdles"), and fibres.
Secondary microplastics — formed when larger plastic breaks down under sunlight (UV), waves and abrasion — e.g., fragments of bottles and bags, and synthetic filaments shed by polyester/nylon clothes during washing (a major source, matching the NCCR finding).
Even smaller particles (below 1 micrometre) are called nanoplastics.

For scale, researchers also classify mesoplastics (5 mm–2.5 cm) and macroplastics (larger) — the categories NCCR monitors. This environmental science is exactly what the CDS/OTA notes on the economy and environment touch.

Where marine litter comes from

The examinable sources:

Land-based (the majority): litter carried by rivers and drains, poorly managed urban waste, and coastal dumping — which is why river cleanliness matters to the sea.
Sea-based: ALDFG — Abandoned, Lost or Discarded Fishing Gear ("ghost nets"), which keeps trapping marine life; plus shipping waste.
Why plastic persists: it is non-biodegradable — it does not rot; it only fragments into ever-smaller pieces that last for hundreds of years.

So the ocean receives a steady flow of plastic mainly from the land, via rivers. These themes recur in the CDS/OTA daily current affairs.

Why microplastics are dangerous

The examinable impacts:

Marine life: fish, turtles and seabirds mistake plastic for food; it blocks their guts and causes starvation. Ghost nets entangle and drown dolphins and turtles.
Food chain & humans: microplastics bioaccumulate — moving up the food chain into fish we eat, and have been detected in salt, water and even human blood. They can carry toxic chemicals and heavy metals adsorbed from seawater.
Ecosystems: litter smothers coral reefs and mangroves; the Gulf of Mannar (a Marine Biosphere Reserve, rich in corals) is precisely such a sensitive area.
Economy: polluted coasts hurt fisheries and tourism.

The revision hook: microplastics = plastic <5 mm; primary (microbeads/pellets) vs secondary (broken-down plastic, synthetic clothing fibres); nanoplastics <1 µm; sources mainly land-based (rivers/drains) plus ALDFG "ghost nets"; plastic is non-biodegradable and bioaccumulates up the food chain; monitored by NCCR (Ministry of Earth Sciences, Chennai) using the Clean Coast Index; Gulf of Mannar = Marine Biosphere Reserve.

India's response to plastic pollution

Round out with the policy toolkit:

Ban on identified single-use plastics (2022) — on items like straws, cutlery, thin carry bags, under the Plastic Waste Management Rules, 2016.
Extended Producer Responsibility (EPR) — makes producers/brand-owners responsible for collecting and recycling the plastic they put on the market.
Swachh Sagar, Surakshit Sagar ("Clean Coast, Safe Sea") — coastal-cleanup campaigns; and Swachh Bharat Mission for waste management on land.
Global: the UN Environment Assembly is negotiating a Global Plastics Treaty; UNCLOS and MARPOL address marine pollution from ships; SDG 14 targets life below water.
Blue economy: clean seas underpin fisheries, tourism and coastal livelihoods.

Why it matters

For the essay/interview and bigger picture:

Food security & health: microplastics entering the seafood chain is a direct public-health concern.
Coastal livelihoods: India's ~7,500 km coastline supports millions of fishers — plastic harms their catch and gear.
Global commons: the ocean is shared, so domestic waste management is also an international responsibility.

Exam relevance in one paragraph

For CDS/OTA GK, retain: microplastics are plastic particles smaller than 5 mm — primary (manufactured small, like microbeads and industrial pellets) or secondary (formed as larger plastic breaks down, including synthetic clothing filaments), with nanoplastics below 1 micrometre; most marine litter is land-based (via rivers and drains), plus sea-based ALDFG ("ghost nets"); plastic is non-biodegradable, bioaccumulates up the food chain and carries toxic chemicals, harming marine life, corals (e.g., the Gulf of Mannar Marine Biosphere Reserve), fisheries and human health; India's National Centre for Coastal Research (NCCR, Ministry of Earth Sciences) monitors microplastics and has developed the Clean Coast Index; policy responses include the single-use plastic ban (2022) under the Plastic Waste Management Rules 2016, Extended Producer Responsibility, Swachh Sagar Surakshit Sagar, and the UN's proposed Global Plastics Treaty (SDG 14). For the essay, frame it as protecting the ocean commons and coastal livelihoods.

🎯 Practice MCQs

Q1. Microplastics are plastic particles smaller than: (a) 5 mm (b) 5 cm (c) 5 metres (d) 5 micrometres only → (a) — 5 millimetres.

Q2. Microbeads in cosmetics are an example of: (a) primary microplastics (b) secondary microplastics (c) nanoplastics only (d) bioplastics → (a) — primary (manufactured small).

Q3. Synthetic fibres shed from clothes in washing are: (a) secondary microplastics (b) primary microplastics (c) organic waste (d) macroplastics → (a) — secondary microplastics.

Q4. Most marine plastic litter originates from: (a) land-based sources via rivers/drains (b) ships only (c) volcanoes (d) fish → (a) — land-based sources.

Q5. "ALDFG", a major sea-based source, stands for: (a) Abandoned, Lost or Discarded Fishing Gear (b) All Land Drainage Flow Group (c) Advanced Litter Data Framework (d) Algal Growth → (a) — abandoned/lost fishing gear ("ghost nets").

Q6. The body monitoring India's coastal microplastics is the: (a) NCCR (b) CPCB only (c) ISRO (d) SEBI → (a) — the National Centre for Coastal Research.

Q7. The NCCR functions under which ministry? (a) Earth Sciences (b) Environment only (c) Fisheries (d) Home Affairs → (a) — the Ministry of Earth Sciences.

Q8. The index developed by NCCR to grade coastal cleanliness is the: (a) Clean Coast Index (b) AQI (c) CPI (d) HDI → (a) — the Clean Coast Index.

Q9. Plastic persists in the environment because it is: (a) non-biodegradable (b) edible (c) water-soluble (d) radioactive → (a) — non-biodegradable (it only fragments).

Q10. Microplastics moving up the food chain into fish and humans is called: (a) bioaccumulation (b) photosynthesis (c) evaporation (d) sedimentation → (a) — bioaccumulation.

Q11. The Gulf of Mannar is notable as a: (a) Marine Biosphere Reserve (rich in corals) (b) desert (c) glacier (d) coalfield → (a) — a Marine Biosphere Reserve.

Q13. "Extended Producer Responsibility" makes ___ responsible for plastic waste. (a) producers/brand owners (b) only consumers (c) only municipalities (d) nobody → (a) — producers and brand owners.

Q14. India's coastal-cleanup campaign is called: (a) Swachh Sagar, Surakshit Sagar (b) Swachh Bharat only (c) Namami Gange (d) Jal Jeevan → (a) — "Clean Coast, Safe Sea."

Q15. Which SDG relates to life below water (oceans)? (a) SDG 14 (b) SDG 3 (c) SDG 7 (d) SDG 11 → (a) — SDG 14.

Q16. Plastic particles smaller than one micrometre are called: (a) nanoplastics (b) macroplastics (c) mesoplastics (d) bioplastics → (a) — nanoplastics.

Q17. The NCCR is headquartered in: (a) Chennai (b) Delhi (c) Goa (d) Kochi → (a) — Chennai.

Q18. The global treaty being negotiated to curb plastic pollution is the: (a) Global Plastics Treaty (under UNEA) (b) Paris Agreement (c) Montreal Protocol (d) Kyoto Protocol → (a) — the Global Plastics Treaty.

📋 How this gets asked (PYQ pattern)

Pollution is a reliable CDS/OTA environment set. The reliable framings are the microplastic size (<5 mm), primary vs secondary, land-based vs sea-based sources (ALDFG), and the policy tools (single-use ban, EPR). A common trap says marine plastic comes mostly from ships (it is mostly land-based) or calls plastic biodegradable. The fresh 2026 hook is the NCCR monitoring and Clean Coast Index — ideal for "which size / which source / which body" items. We reference the pattern, not any exact past question.

Preparing for CDS or OTA? Plastic pollution, oceans and environmental policy are high-yield topics and strong essay material on sustainability. Follow our daily CDS/OTA current affairs and train with serving-officer faculty in the upcoming Cavalier courses in Delhi.

✍️ Written by Aditya Tiwari — Economy, environment & current-affairs faculty at The Cavalier. Reviewed by the Cavalier Faculty Desk. The Cavalier, founded by ex-Army officers, has trained NDA/CDS/SSB aspirants since 2001 (Facebook · YouTube).

Source: PIB / Ministry of Earth Sciences (NCCR), 29 July 2026. Facts cross-verified with independent sources.

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