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  • Bengaluru gets its 2nd Biodiversity Heritage Site (BHS)

    Why in the News?

    The Karnataka government declared 8.6 acres of green cover at Cantonment Railway Colony in Bengaluru as a Biodiversity Heritage Site (BHS), the second such site in the city after Gandhi Krishi Vigyan Kendra (GKVK).

    About Biodiversity Heritage Sites (BHS):

    • Legal Basis: Recognized under Section 37(1) of the Biological Diversity Act, 2002 as ecologically sensitive areas of high biodiversity.
    • Notifying Authority: The State Government, in consultation with local bodies, can declare an area as a BHS.
    • Objective: Conserves wild and domesticated species, including rare, threatened, and keystone species, vital for ecological balance.
    • Significance: Marked as ecologically fragile zones, essential for sustaining local ecosystems and long-term sustainability.
    • Community Role: Local communities and institutions are actively involved in management and protection.
    • Restrictions Put: Declaration does NOT restrict customary uses; aims to enhance quality of life through conservation.
    • Institutional Support: State Biodiversity Boards (SBBs) and Biodiversity Management Committees (BMCs) assist in proposing, managing, and monitoring BHS.
    • First BHS in India: Nallur Tamarind Grove, Bengaluru, Karnataka, notified in 2007.
    [UPSC 2023] Consider the following statements:

    1. In India, the Biodiversity Management Committees are key to the realization of the objectives of the Nagoya Protocol.

    2. The Biodiversity Management Committees have important functions in determining access and benefit sharing, including the power to levy collection fees on the access of biological resources within its jurisdiction.

    Which of the statements given above is/are correct?

    Options: (a) 1 only (b) 2 only (c) Both 1 and 2* (d) Neither 1 nor 2

     

  • In news: Sahyadri Tiger Reserve

    Why in the News?

    The Union Environment Ministry has approved the capture and translocation of eight tigers from Tadoba-Andhari and Pench reserves to the Sahyadri Tiger Reserve (STR) in western Maharashtra.

    In news: Sahyadri Tiger Reserve

    About Sahyadri Tiger Reserve (STR):

    • Overview: Situated in the Sahyadri Range, Western Ghats (Maharashtra), spanning districts of Satara, Sangli, Kolhapur, Ratnagiri.
    • Status: Declared Tiger Reserve (2010); part of UNESCO Western Ghats World Heritage Site (2012).
    • Geography: Dominated by Shivsagar (Koyna) and Vasant Sagar (Warana) reservoirs.
    • Vegetation: Moist evergreen, semi-evergreen, moist & dry deciduous forests; endemic trees like karvi, bamboo, Terminalia, Emblica.
    • Fauna: Bengal tiger, leopard, dhole, gaur, antelopes, mouse deer, giant squirrel. Birds include hornbills, vultures, river tern.
    • Tiger Status: Tigers absent for years; 5–9 present since 2018 (as per camera trap evidence).
    • Corridor Linkages: Connected to Radhanagari WLS (north) and Anshi–Dandeli TR (south, Karnataka), forming a key Western Ghats corridor.
    • Ecological Role: Secures catchments of Koyna & Warna rivers, crucial for farming and livelihoods.

    Need for Tiger translocation:

    • Prey base: Reserve has prey-rich habitat but lacks a stable breeding tiger population.
    • Other benefits: Prevents local extinction, strengthens corridor connectivity, supports Project Tiger, conserves biodiversity, and secures river watersheds.
    [UPSC 2017] From the ecological point of view, which one of the following assumes importance in being a good link between the Eastern Ghats and the Western Ghats?

    Options: (a) Sathyamangalam Tiger Reserve* (b) Nallamala Forest (c) Nagarhole National Park (d) Seshachalam Biosphere Reserve

     

  • What is Decentralised Finance (DeFi)?

    Why in the News?

    Decentralised Finance (DeFi) is rapidly expanding as a global financial innovation, enabling direct peer-to-peer transactions without intermediaries such as banks.

    What is DeFi?

    • It is a financial system that runs on blockchains like Ethereum.
    • It allows people to send, borrow, lend, invest, and trade money directly without banks.
    • All transactions happen using smart contracts (computer programs) and apps called dApps.
    • Anyone with a phone + internet can use it; no bank account or KYC needed.

    Features of DeFi:

    • No middlemen: Works without banks or brokers.
    • Smart contracts: Deals happen automatically once rules are met.
    • Open access: Anyone in the world can join with just a digital wallet.
    • Transparency: Every transaction is recorded on a blockchain for all to see.
    • Cross-border: Can be used internationally, without currency or banking restrictions.
    • Low cost & fast: Cheaper and quicker than traditional banking.
    • Anonymous: Many platforms don’t ask for ID, making it open but risky.

    DeFi in India:

    • Adoption: India ranks third globally in DeFi value (Chainalysis Global Crypto Adoption Index 2024).
    • Growth Drivers:
      • Large youth population and widespread smartphone use.
      • Strong digital payments ecosystem (UPI, JAM trinity).
      • Increasing retail investor interest in crypto-assets.
    • Uses: Indian users engage in lending, trading, yield farming, and staking via DeFi platforms like Aave, Compound, and SushiSwap.
    • Market Size: Projected to reach USD 1.7 billion by 2025.
    • Challenges: Regulatory uncertainty, risks of money laundering and terror financing, cyber vulnerabilities, and lack of investor protection.
  • BS-VII Emission Norms

    Why in the News?

    To align India’s automobile sector with global standards, the government is planning to introduce BS VII emission norms by 2026-27.

    About BS7 Norms:

    • Overview: India’s equivalent of Euro 7 emission standards, aimed at reducing vehicular pollution and aligning with global benchmarks.
    • Coverage: Applies uniformly to cars, vans, buses, trucks, petrol, diesel, hybrid, and electric vehicles.
    • On-Board Monitoring (OBM): New system to monitor tailpipe emissions in real time, covering NOx, ammonia, PM, engine gases.
    • Non-Exhaust Regulation: First-time regulation of brake dust (PM) and tyre microplastics.
    • EV Standards: Introduces battery safety, durability, and longevity index to lower raw material use and build consumer confidence.
    • Digital Safeguards: Ensures vehicles are not tampered with and remain within emission limits.
    • Testing Scope: Expands checks to real driving conditions beyond lab-based cycles.

    Key Differences: BS6 vs BS7

    • OBD vs OBM: BS6 used On-Board Diagnostics (OBD); BS7 brings OBM for direct emission monitoring.
    • NOx Standards: BS6 allowed 60 mg/km petrol, 80 mg/km diesel; BS7 sets uniform 60 mg/km.
    • Coverage: BS6 regulated exhaust only; BS7 adds non-exhaust (brakes, tyres).
    • EV Inclusion: BS6 ignored EVs; BS7 regulates battery life, safety, and replacement cycles.
    • Testing: BS6 relied on defined test cycles; BS7 uses broader real-world conditions.
    • Technology Push: BS7 compels automakers towards advanced emission-control systems and turbo, direct-injection engines.
    • Cost Factor: BS7 compliance raises vehicle costs; some older models may be discontinued.

    History of Emission Norms in India:

    Year / Period Key Development
    1991 Mass emission norms introduced for petrol vehicles.
    1992 Mass emission norms introduced for diesel vehicles.
    April 1995 Mandatory catalytic converters in new petrol cars in Delhi, Mumbai, Kolkata, Chennai; unleaded petrol (ULP) introduced.
    2000 Introduction of Euro I equivalent “India 2000” norms for passenger and commercial vehicles; stricter norms for two-wheelers.
    2001 Euro II equivalent Bharat Stage II (BS II) norms introduced in Delhi, Mumbai, Chennai, Kolkata.
    August 2002 First Auto Fuel Policy announced, outlining emission and fuel roadmap up to 2010.
    April 2005 Bharat Stage III (BS III) norms implemented in 13 metro cities; rest of India continued with BS II.
    April 2010 Bharat Stage IV (BS IV) implemented in 13 metro cities; rest of India adopted BS III.
    October 2014 BS IV extended to 20 more cities.
    2013 Auto Fuel Policy 2025 submitted to MoPNG (Ministry of Petroleum & Natural Gas), outlining roadmap up to 2025.
    April 2017 Nationwide implementation of BS IV.
    April 2020 Direct leap to BS VI (skipping BS V) due to severe pollution in Delhi NCR.
    Upcoming (BS VII) To be aligned with Euro 7 standards: stricter norms, On-Board Monitoring (OBM), coverage of brake & tyre emissions, and EV battery standards.

     

    [UPSC 2004] Consider the following statements:

    1. The Oil Pool Account of Government of India was dismantled with effect from 1-4-2002.

    2. Subsidies on PDS kerosene and domestic LPG are borne by Consolidated Fund of India.

    3. An expert committee headed by Dr. R.A. Mashelkar to formulate a national auto fuel policy recommended that Bharat Stage-II Emission Norms should be applied throughout the country by 1 April, 2004.

    Which of these statements given above are correct?

    Options: (a) 1 and 2 (b) 2 and 3 (c) 1 and 3 (d) 1, 2 and 3*

     

  • Researchers develop Red Ivy Plant-Based Wound-Healing Pad

    Why in the News?

    Researchers at JNTBGRI has developed a multifunctional wound-healing pad using nanomaterials, inspired by the red ivy plant (Strobilanthes alternata), traditionally used in folk medicine.

    About the Red Ivy Plant:

    • Overview: Strobilanthes alternata, locally called murikooti pacha, belonging to the Acanthaceae family.
    • Habitat: Found abundantly in tropical regions, including India.
    • Traditional Use: Used in folk medicine for treating cuts and wounds.
    • Scientific Discovery: JNTBGRI, Palode isolated acteoside, a natural bioactive compound, for the first time in this plant.
    • Therapeutic Use: Acteoside, known elsewhere for medicinal activity, showed high wound-healing efficacy at 0.2% concentration in red ivy.

    Features of the Wound-Healing Pad:

    • Design: India’s first multifunctional herbal wound dressing pad, combining traditional knowledge with nanotechnology.
    • Components: Electro-spun nanofiber layer (biodegradable, porous, antimicrobial barrier); Acteoside + neomycin sulfate blend (healing and infection control); Sodium alginate sponge (absorbs exudates); Activated carbon layer (controls odour).
    • Significance: Affordable, scalable, and a model of herbal medicine integrated with modern nanotech innovation.
    [UPSC 2021] Which one of the following is used in preparing a natural mosquito repellent?

    Options:

    (a) Congress grass (b) Elephant grass (c) Lemongrass* (d) Nut grass

     

  • Expedition ‘Samudra Pradakshina’

    Why in the News?

    Defence Minister flagged off Samudra Pradakshina, the world’s first tri-service all-women circumnavigation sailing mission, from the Gateway of India, Mumbai.

    About Expedition ‘Samudra Pradakshina’:

    • Overview: First-ever all-women tri-service circumnavigation sailing expedition in the world.
    • Crew: Ten women officers from the Army, Navy, and Air Force, led by Lt. Col. Anuja Varudkar.
    • Vessel: IASV Triveni, a 50-foot yacht built indigenously in Puducherry.
    • Duration & Route: Nine months, covering 26,000 nautical miles, crossing the Equator twice, and rounding Capes Leeuwin, Horn, and Good Hope.
    • Port Calls: Fremantle (Australia), Lyttelton (New Zealand), Buenos Aires (Argentina), Cape Town (South Africa).
    • Mission Objectives: Showcase Nari Shakti, promote joint military cooperation, advance Atmanirbhar Bharat, strengthen maritime diplomacy, and conduct ocean research with the National Institute of Oceanography.

    Historic Precursors:

    • Sir Robin Knox-Johnston (UK):  First solo non-stop circumnavigation (1969).
    • Captain Dilip Donde (2009–10): First Indian solo circumnavigation. Commander Abhilash Tomy (2012–13) — first Indian solo non-stop circumnavigation.
    • Women-led Expeditions: Navika Sagar Parikrama (2017–18)– first all-women Indian Navy circumnavigation on INSV Tarini. Navika Sagar Parikrama-II (2024–25) – second successful all-women naval circumnavigation on INSV Tarini.
    [UPSC 2025] Operations undertaken by the Army towards upliftment of the local population in remote areas to include addressing of their basic needs is called:

    Options:

    (a) Operation Sankalp (b) Operation Maitri (c) Operation Sadbhavana* (d) Operation Madad

     

  • Vultures and Pandemic Prevention

    Why in the News?

    Vultures, vital for carcass disposal and disease control, are key to pandemic preparedness.

    About Vulture Species in India:

    • Overview: Vultures are among 22 global species of large scavenger birds, found mostly in tropics and subtropics.
    • Ecological Role: Serve as nature’s garbage collectors, preventing disease spread and maintaining balance in ecosystems.
    • Indian Diversity: India hosts 9 species — Oriental white-backed, Long-billed, Slender-billed, Himalayan, Red-headed, Egyptian, Bearded, Cinereous, and Eurasian Griffon.

    Vultures and Pandemic Prevention

    Distribution and Population Trends:

    • Historic Abundance: In the 1980s, India had over 40 million vultures, often in large groups near carcass dumps.
    • Population Crash: Since the 1990s, numbers have declined by over 95%, mainly due to diclofenac poisoning from veterinary use.
    • Flyway Connection: Vultures are part of the Central Asian Flyway (CAF), linking breeding sites in Central Asia with South Asia’s wintering zones.
    • Global Relevance: The CAF spans 30+ countries, making vulture conservation a regional and international public health concern.

    Vultures and Pandemic Preparedness:

    • Carcass Disposal: By consuming dead animals, vultures stop spread of pathogens such as anthrax, Clostridium botulinum, rabies.
    • Bio-Monitor Role: As first responders at carcasses, they act as natural surveillance systems, reducing risks of zoonotic spillover.
    • Conservation Gap: Protection of vultures is rarely included in One Health strategies, despite being low-cost compared to pandemic response.
    • Community Involvement: Local communities coexisting with vultures can aid in awareness, conservation, and disease monitoring, but remain underutilised.
    [UPSC 2012] Vultures which used to be very common in Indian countryside some years ago are rarely seen nowadays. This is attributed to:

    (a) the destruction of their nesting sites by new invasive species disease among them

    (b) a drug used by cattle owners for treating their diseased cattle persistent and fatal*

    (c) scarcity of food available to them

    (d) a widespread, persistent and fatal disease among them

     

  • In news: Pugad Island

    Why in the News?

    The Philippine island of Pugad in Manila Bay is facing an existential threat as rising sea levels and rapid land subsidence combine to submerge homes and livelihoods.

    About Pugad Island:

    • Overview: Small 7-hectare island in Manila Bay, situated at the mouth of the Angat–Pampanga River Delta, under Hagonoy municipality, Bulacan province, Philippines.
    • Population: Home to about 1,636–2,056 residents, living in a single clustered village of roughly 384 houses.
    • Livelihoods: Community depends on fishing and aquaculture, with families cultivating clams, mussels, and whiting fish in converted fishponds.
    • Living Conditions: Houses built mainly from bamboo and old metal sheets, with poor sanitation, minimal healthcare facilities, and only elementary-level schooling.
    • Flooding Challenge: Regularly hit by high-tide and monsoon floods, made worse by land subsidence (11 cm/year) and sea-level rise (three times global average).
    • Environmental Hazards: Loss of mangroves, urban encroachment, and exposure to typhoons increase risks of disaster and displacement.
    [UPSC 2018] Which of the following has/have shrunk immensely/dried up in the recent past due to human activities?

    1.Aral Sea 2.Black Sea 3.Lake Baikal

    Select the correct answer using the code given below:

    (a) 1 only (b) 2 and 3 only (c) 2 only (d) 1 and 3*

     

  • To build Roads is to build peace: Developmet in tribal hinterlands affected by Maoist Insurgency

    Introduction

    Roads in India’s Maoist-affected areas are more than physical infrastructure; they are symbols of the state itself. For communities long governed by neglect or non-state actors, the arrival of a road often marks the first visible sign of governance. Research and field evidence indicate that road development improves access to electricity, healthcare, education, and security while simultaneously displacing the influence of insurgents. Yet, roads alone cannot resolve conflict—they must be embedded in an ecosystem of justice, dignity, and inclusion.

    Why is this in the news?

    In regions affected by Maoist insurgency, particularly in Chhattisgarh, Jharkhand, and Odisha, roads have emerged as a strategic instrument of peacebuilding. Recent studies (Jain & Biswas, 2023) show a correlation between road connectivity and reduced crime, while international evidence (Prieto-Curiel & Menezes, 2020) highlights how poor connectivity perpetuates violence globally. This marks a shift in governance strategy, from viewing infrastructure as purely developmental to recognizing it as a political and stabilising force.

    How do roads reclaim governance from insurgents?

    1. Governance presence: Roads bring schools, clinics, and police stations, representing visible and accountable state authority.
    2. Displacement of parallel systems: Maoists often establish informal courts, taxation systems, and welfare activities in remote areas. Roads weaken these structures by enabling the state to reclaim legitimacy.
    3. Diego Gambetta’s insight: Like the Sicilian Mafia, insurgents thrive where the state withdraws. Infrastructure fills the governance vacuum.

    What role do insurgent groups play in governance gaps?

    1. Informal welfare: Research by Alpa Shah (2018) and Human Rights Watch (2009) shows Maoists provide rudimentary health and welfare services in villages.
    2. Strategic legitimacy: As Zachariah Mampilly (2011) argues, such services are not altruistic but intended to gain legitimacy.
    3. Coercion with care: Maoist medical aid or welfare is tied to fear and control, not democratic accountability.

    Why are extralegal institutions problematic?

    1. Absence of safeguards: Maoist-run “jan adalats” often issue punishments, even executions, without due process.
    2. Opaque justice: Decisions reflect entrenched hierarchies, patriarchy, and mob reprisals rather than rule of law.
    3. Comparison with khap panchayats: Like insurgent institutions, caste councils also deliver swift but exclusionary justice outside constitutional norms.

    How do roads act as political infrastructure?

    1. Symbolic presence: Each road signals that “the state is here to stay,” as seen in Chhattisgarh under B.V.R. Subrahmanyam’s governance strategy.
    2. Crime reduction: Jain and Biswas (2023) show connectivity lowers rural crime rates.
    3. Global parallels: Prieto-Curiel & Menezes (2020) demonstrate that poor connectivity correlates with higher violence across contexts.

    What safeguards are essential for success?

    1. Justice mechanisms: Roads must be accompanied by functioning courts and legal institutions to prevent arbitrary authority.
    2. Healthcare and welfare: Clinics, schools, and social infrastructure ensure that development is inclusive.
    3. Community participation: Roads must be built with the village, not just through the village, to ensure legitimacy and trust.

    Conclusion

    Roads in conflict-prone tribal regions represent more than mobility, they embody the arrival of governance and the possibility of peace. Yet, infrastructure without justice risks becoming a symbol of control rather than inclusion. For lasting impact, roads must be accompanied by democratic institutions, safeguards, and rights-based governance. To build roads, then, is indeed to build peace.

    Value Addition

    Naxalism: Definition & Origins

    • Definition: Left-Wing Extremism (LWE); armed, rural-based movement rooted in land alienation, poverty, displacement, forest rights, and state neglect.
    • Origins: Began with the 1967 Naxalbari peasant uprising in West Bengal; later consolidated under CPI (Maoist) formations.
    • Areas Most Affected — Historical Peak (late 2000s)
      • Spread: Nearly 180 districts across multiple states — the so-called Red Corridor.
      • Core states: Chhattisgarh, Jharkhand, Odisha, Bihar, Andhra Pradesh/Telangana, parts of Maharashtra & Madhya Pradesh.
    • Areas Most Affected — Recent (2024–25)
      • Reduced footprint: Down to ~38 districts (2024); further shrinking per 2025 statements.
      • Residual hotspots: Bastar (Chhattisgarh), Gadchiroli (Maharashtra), parts of Jharkhand & Odisha, and Chhattisgarh–Telangana border.
    • Why This Shift Matters 
      • Then: Widespread insurgency → blanket rural development response.
      • Now: Concentrated in forested pockets → targeted counter-insurgency + development (roads, police camps, rehabilitation).

    What is Operation Black Forest?

    • What / where / when: Operation Black Forest (also reported as Operation Kagar in some outlets) was a focused anti-Maoist offensive launched along the Chhattisgarh–Telangana border in April–May 2025 targeting PLGA (People’s Liberation Guerrilla Army) units in hilly forest belts such as the Kareguttalu/Karegutta hills. 
    • Claimed outcomes (official account): The government/security forces announced significant results — arrests, large recoveries of IEDs, explosives and weapons and the neutralisation (killed/captured) of several Maoists; the Home Minister hailed the operation as a major success and linked it to the government’s goal of a “Naxal-free India.’’

    India’s Current Strategy Against Naxalism

    • Security operations & coordination – Intensified offensives (e.g., Operation Black Forest), joint CRPF/state police actions, inter-state Unified Commands.
    • Connectivity first – Roads → schools → clinics → police camps; infrastructure as the entry point of governance.
    • Surrender & rehabilitation – Incentives for cadres to lay down arms, with livelihood and legal reintegration support.
    • Technology & intelligence – Use of UAVs, better signal interception, geolocation, and joint intel sharing.
    • Development & governance – Focus on PESA, land and forest rights, MGNREGA, social welfare schemes to address grievances.
    • Exam angle: India uses a mix of “hard” (security, tech) and “soft” (development, rights, rehab) measures — success lies in balancing both.

    Way Forward (Practical + Scholarly Insights)

    • Consolidate gains, avoid militarised development – Pair operations with public-goods delivery to build trust.
    • Rights-based development – Implement PESA/FRA in spirit; ensure Gram Sabha consent and agency.
    • Build accountable institutions – Mobile courts, health camps, schools, and police with transparency; replace jan adalats with constitutional justice.
    • Credible rehabilitation – Beyond cash payouts, provide skills, jobs, and long-term livelihood security.
    • Address political economy – Regulate mining/plantation projects; enforce benefit-sharing and consent to prevent discontent.
    • Theoretical insights – Gambetta: extralegal actors thrive in governance vacuums → fill with state services. Mampilly: insurgent welfare is strategic → counter with accountable service delivery.
    • Human rights monitoring – Independent oversight of security and development efforts to ensure legitimacy.
    • One-liner synthesis for mains: Operational successes show improved reach, but a true “Naxal-free” India requires roads + rights + jobs anchored in constitutional justice and inclusive governance.

    PYQ Relevance

    [UPSC 2022] Naxalism is a social, economic and development issues manifesting as a violent internal security threat. In this context, discuss the emerging issues and suggest a multilayered strategy to tackle the menace of Naxalism.

    Linkage: The article shows how roads act as instruments of governance, reducing isolation and weakening insurgent legitimacy, thereby addressing the socio-economic roots of Naxalism. Yet, it cautions that infrastructure alone cannot resolve conflict unless coupled with justice, healthcare, education, and community participation. This aligns with the PYQ’s call for a multi-layered strategy—combining development, security, and rights-based governance.

  • Swachh Vayu Survekshan, 2025

    Why in the News?

    Indore, already recognized as the cleanest city in India, has topped the list of million-plus population cities in the Swachh Vayu Survekshan 2025.

    Swachh Vayu Survekshan, 2025

    About Swachh Vayu Survekshan (SVS), 2025:

    • Overview: Annual survey by the Ministry of Environment, Forest and Climate Change (MoEFCC) under the National Clean Air Programme (NCAP).
    • Objective: Promotes healthy competition among cities and accelerates implementation of air quality measures.
    • Coverage: Includes 130 cities, grouped into 3 categories: million-plus population, 3–10 lakh population, and under 3 lakh population.
    • Parameters: Cities assessed on 8 factors such as road dust mitigation, solid waste management, vehicular emission control, industrial emission control, construction and demolition waste handling, public awareness, and particulate matter (PM10/PM2.5) reduction.
    • Methodology: Uses a multi-tier evaluation focusing on both on-ground actions and measurable outcomes.

    Key Findings of SVS, 2025:

    • Top Performer: Indore ranked 1st among million-plus cities, regaining its position after slipping to 6th in 2024. It had also topped in 2023, while Lucknow topped the inaugural edition in 2022.
    • Other Million-Plus Rankings: Jabalpur 2nd, Agra and Surat 3rd, Navi Mumbai 4th, Kanpur 5th, Bhopal 6th, Allahabad 7th, Chandigarh 8th, Ahmedabad–Pune–Nagpur 10th, Varanasi and Raipur 11th, Lucknow 15th, Hyderabad 22nd, Mumbai 25th, Jaipur 26th, Delhi 32nd, Bengaluru 36th, Kolkata 38th, Chennai 41st.
    • 3–10 Lakh Cities: Amravati 1st, Jhansi and Moradabad joint 2nd, Alwar 3rd.
    • Under-3 Lakh Cities: Dewas 1st, Parwanoo 2nd, Angul 3rd.
    • Air Quality Data: Indore recorded PM10 at 83 μg/m³ in 2024–25, slightly higher than 82 μg/m³ in 2017–18. Cities like Chennai (58 μg/m³), Varanasi (59 μg/m³), Bengaluru (68 μg/m³), and Hyderabad (81 μg/m³) showed lower PM10 levels than Indore.
    • Overall Trends: 103 of 130 cities reduced PM10 since 2017–18. 64 cities achieved a 20% reduction, while 25 cities achieved a 40% reduction. Only 22 cities met the national standard of ≤60 μg/m³, with Chennai the only metro (58 μg/m³). Among metros, Mumbai recorded the highest decline (44%), followed by Kolkata (37%), Hyderabad (26%), Bengaluru (26%), Delhi (15%), and Chennai (12%).
    [UPSC 2022] In the context of WHO Air Quality Guidelines, consider the following statements:

    1. The 24-hour mean of PM 2.5 should not exceed 15 μg/m3 and annual mean of PM 2.5 should not exceed 5 μg/m3.

    2. In a year, the highest levels of ozone pollution occur during the periods of inclement weather.

    3. PM 10 can penetrate the long barrier and enter the bloodstream.

    4. Excessive ozone in the air can trigger asthma.

    Which of the statements given above are correct?

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