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  • DRDO achieves milestone in Scramjet Hypersonic Engine Development

    Why in the News?

    The DRDO Laboratory (DRDL), located in Hyderabad, successfully demonstrated long-duration Active Cooled Scramjet Subscale Combustor ground testing for over 1,000 seconds.

    About Hypersonic Cruise Missiles:

    • Hypersonic cruise missiles are advanced weapons capable of travelling at speeds greater than Mach 5 (approximately 6,100 km/h), making them 5x faster than the speed of sound.
    • These missiles use Scramjets (Supersonic Combustion Ramjets) powered by atmospheric oxygen, making them more efficient for long-duration travel compared to traditional missiles that carry their own oxidizers.
    • They maintain high speeds and are highly manoeuvrable, making them difficult to intercept by current missile defense systems.
    • They can strike targets at long ranges with minimal warning and penetrate advanced defense shields.

    DRDO’s Achievement:

    • The DRDO successfully conducted long-duration Active Cooled Scramjet Subscale Combustor ground testing for over 1,000 seconds.
    • This test advances India’s capability to develop hypersonic cruise missiles, validating the design of the scramjet combustor and the test facility, both crucial for developing air-breathing propulsion systems.
    • This paves the way for full-scale flight-worthy combustor testing, bringing India closer to developing functional hypersonic missiles and enhancing its defense capabilities.
    [UPSC 2023] Consider the following statements:

    1. Ballistic missiles are jet-propelled at subsonic speeds throughout their fights, while cruise missiles are rocket-powered only in the initial phase of flight.

    2. Agni-V is a medium-range supersonic cruise missile, while BrahMos is a solid-fuelled intercontinental ballistic missile.

    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*

     

  • Places in News: Sea of Marmara

    Why in the News?

    A powerful earthquake with a magnitude of 6.2 struck Istanbul and surrounding areas with its epicenter located beneath the Sea of Marmara.

    About the Sea of Marmara

    • The Sea of Marmara is a small but significant inland sea in Turkey, acting as a transition zone between the Black Sea and the Aegean Sea.
    • It holds geographical, ecological, and cultural importance, separating Asia and Europe within Turkey.
    • It spans 11,350 km², it is 280 km long and 80 km wide.
    • It is connected to the Black Sea in the northeast via the Bosphorus Strait and to the Aegean Sea in the southwest via the Dardanelles Strait.
    • It receives cold, fresh water from the Black Sea and warmer, saltier water from the Mediterranean, creating a unique fresh-to-salty water transition.
    • The region experiences a humid subtropical climate with hot summers and cold, wet winters, influencing the marine ecosystem.
    • The North Anatolian Fault runs beneath the sea, causing significant earthquake risks, including the recent 6.2 magnitude earthquake near Istanbul.
    • It is home to several islands, including Marmara Island (the largest) and Prince Islands.
    • The city of Istanbul lies along its coastline.
    [UPSC 2014] Turkey is located between:

    Options: (a) Black Sea and Caspian Sea (b) Black Sea and Mediterranean Sea (c) Gulf of Suez and Mediterranean Sea (d) Gulf of Aqaba and Dead Sea

     

  • India to ban Chlorpyrifos  

    Why in the News?

    Policymakers and scientists are set to gather in Geneva for the Conferences of the Parties to the Basel, Rotterdam, and Stockholm (BRS) Conventions.

    India’s Pesticide Action Network will advocate for a global ban on Chlorpyrifos, a toxic pesticide still in use despite being banned in over 40 countries.

    About Chlorpyrifos:

    • Chlorpyrifos is an organophosphate pesticide used to control pests, including insects, fungi, and weeds on crops like corn, soybeans, and fruits, as well as non-crop areas like turf and buildings.
    • It disrupts the nervous system of pests by inhibiting acetylcholinesterase, an enzyme critical for nerve function, causing paralysis and death in pests.
    • Despite being banned in over 40 countries due to its environmental and health risks, it continues to be used in many countries, including India.

    Chlorpyrifos in India:

    • Not entirely banned in India; It is registered under the Insecticides Act of 1968, with restrictions such as a ban on its use on ber, citrus, and tobacco (as per a 2023 notification).
    • But it is also used on other crops, including rice, cotton, groundnut, and onion.
    • India is one of the largest producers and exporters of Chlorpyrifos globally.

    Threats Posed by Chlorpyrifos:

    • Human Health Risks: Linked to nervous system issues, developmental disorders in children, cancer, and liver/kidney damage.
    • Environmental Impact: Highly toxic to aquatic life and pollinators like bees.
    • Soil & Crop Contamination: Persistent in the environment, leading to pesticide residue in the food chain.
    • Biodiversity Loss: Affects non-target species, disrupting ecosystems.
    • Resistance: Overuse leads to pesticide resistance, requiring more harmful chemicals for pest control.
    [UPSC 2019] In India, the use of carbofuran, methyl parathion, phorate and triazophos is viewed with apprehension. These chemicals are used as-

    Options: (a) pesticides in agriculture * (b) preservatives in processed foods (c) fruit-ripening agents (d) moisturising agents in cosmetics

     

  • Power and freedom: On the Senthilbalaji case

    Why in the News?

    On April 23, the Supreme Court told Tamil Nadu Minister V. Senthilbalaji, who has been out on bail since September 2024 in a money laundering case, to choose between keeping his position or his freedom. This was an expected statement.

    Why did the Supreme Court question V. Senthilbalaji’s continuation in office while on bail?

    • Conflict of Interest Between Bail and Office: The Supreme Court questioned V. Senthilbalaji’s continuation in office while on bail in a money laundering case, suggesting that he should choose between his ministerial position and his freedom. Eg: The Court pointed out the issue of a person facing serious criminal charges holding a high office of responsibility.
    • Concerns About Potential Witness Tampering: The Court expressed concerns that Senthilbalaji might tamper with evidence or influence witnesses due to his position of power. Eg: Justice Oka’s remark that Senthilbalaji might prevent witnesses from testifying indicated the gravity of the situation.
    • Premature Re-induction Into the Cabinet: The Supreme Court had previously granted bail to Senthilbalaji not on merits, but because he had already served one year in detention. His return to the Cabinet shortly after this raised doubts, as the Court had not cleared him of the charges. Eg: This was exemplified by the Court’s remark that it had made a “mistake” in granting him bail.

    What concerns did the Supreme Court raise about Senthilbalaji’s conduct?

    • Dishonest Conduct and Risk of Evidence Tampering: The Supreme Court raised concerns about Senthilbalaji’s dishonest conduct and the potential risk of him tampering with evidence or influencing witnesses in the case. Eg: Justice Oka’s remark about Senthilbalaji ensuring no witnesses come to the box reflected this concern.
    • Inappropriate Return to the Cabinet While Facing Serious Charges: The Court questioned the propriety of Senthilbalaji being re-inducted into the Cabinet while facing serious criminal charges. Eg: The Court had previously stated that granting bail was not based on merits, but on the time already served, which raised doubts about his fitness for office.

    Why is Senthilbalaji’s re-induction into the Cabinet legally scrutinized?

    • Bail Conditions Not Fully Met: Senthilbalaji’s re-induction into the Cabinet is legally scrutinized because he was granted bail not on merits but on the ground that he had already spent one year in incarceration as an undertrial. Eg: The Court had questioned his return to the Cabinet just after granting him bail, highlighting concerns over his ongoing legal situation.
    • Impact on Fair Trial and Public Perception: His re-induction raises questions about the fairness of his trial and the potential to undermine justice. Eg: The Supreme Court had earlier expressed its objection to his return to the Cabinet, stating that it could negatively affect the victims of the job scandal and the integrity of the trial process.

    Why should Senthilbalaji avoid staying in the Cabinet?

    • Legal and Ethical Concerns: Senthilbalaji’s continued stay in the Cabinet raises legal and ethical issues due to the money laundering case against him. Eg: The Supreme Court’s remarks about the possibility of tampering with evidence and influencing witnesses highlight the risks of him holding a position of power while facing serious charges.
    • Risk of Damage to Reputation and Governance: His re-induction into the Cabinet could harm the government’s reputation and undermine public trust in governance. Eg: The Court had earlier granted him bail on humanitarian grounds, not on merits, and his return to the Cabinet despite ongoing charges could be seen as improper, potentially leading to political fallout.

    Way forward: 

    • Resignation for Upholding Integrity: Senthilbalaji should voluntarily resign from the Cabinet to maintain the integrity of the government and avoid further legal scrutiny.
    • Clear Legal Resolution: A clear and swift legal resolution should be sought, ensuring that the charges are addressed transparently, without political interference, to restore public confidence.

    Mains PYQ:

    [UPSC 2024] The Doctrine of Democratic Governance makes it necessary that the public perception of the integrity and commitment of civil servants becomes absolutely positive. Discuss.

    Linkage: Although focused on civil servants, the underlying principle of integrity and public perception in governance is relevant to the case of a Minister like Mr. Senthilbalaji, especially given the Supreme Court’s observations on his conduct.

  • Pakistan suspends 1972 Simla Agreement

    Why in the News?

    Pakistan has announced its decision to suspend the Simla Agreement with India, a landmark peace accord signed in 1972 following the India-Pakistan war.

    Simla Agreement

    About the Simla Agreement

    • The Simla Agreement was signed on July 2, 1972, between Indira Gandhi (India) and Zulfikar Ali Bhutto (Pakistan) following the 1971 India-Pakistan war and the creation of Bangladesh.
    • The agreement aimed to establish lasting peace, address issues arising from the war, and reaffirm respect for the Line of Control (LoC) in Jammu and Kashmir.

    Key Terms of the Agreement:

    1. Respect for Territorial Integrity: Both countries agreed to respect sovereignty and internal affairs, with the LoC as the de facto boundary in Kashmir.
    2. Line of Control (LoC): Both parties agreed not to alter the LoC unilaterally, maintaining its status established after the 1971 ceasefire.
    3. Promotion of Durable Peace: A commitment to resolve disputes peacefully and normalize relations, including transportation, postal services, and trade.
    4. Dispute Resolution: The agreement emphasized bilateral dialogue for resolving issues, particularly the Kashmir dispute, without third-party intervention.
    5. Non-interference & No Use of Force: Both nations pledged to refrain from interfering in internal matters and from using force or threats of force.

    Line of Control (LoC) and the 1949 Karachi Agreement:

    • Following the 1947-48 India-Pakistan war, a UN-brokered ceasefire led to the establishment of the LoC.
    • The 1949 Karachi Agreement demarcated the ceasefire line, running from Manawar (south) to the glaciers (north), forming the basis for the LoC.
    • Despite the Simla Agreement, there have been multiple conflicts, such as Siachen (1984) and Kargil War (1999), where Pakistan attempted to alter the LoC, leading to military responses from India.

    Challenges in Implementing the Agreement

    • Kargil War (1999): Pakistan’s violation of the LoC during the Kargil War highlighted ongoing tensions.
    • Siachen Glacier: Pakistan’s actions in the Siachen Glacier conflict violated the agreement, leading to military action (Operation Meghdoot, 1984) by India.
    [UPSC 2003] Consider the following statements regarding the relations between India and Pakistan:

    1. During Shimla Agreement, Indira Gandhi and Zulfikar Bhutto agreed to maintain the sanctity of LOC.

    2. Lahore Summit took place in the year 1997.

    3. Islamabad Summit was held between Rajiv Gandhi and Nawaz Sharif.

    Which of these statements is/are correct?

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

     

  • What is SAARC Visa Exemption Scheme?

    Why in the News?

    In response to the deadly terrorist attack in Pahalgam, India has announced the suspension of the SAARC Visa Exemption Scheme (SVES) for Pakistani nationals.

    Note: The South Asian Association for Regional Cooperation (SAARC) was founded in 1985, consisting of eight member states: Afghanistan, Bangladesh, Bhutan, India, Maldives, Nepal, Pakistan, and Sri Lanka.

    About the SAARC Visa Exemption Scheme (SVES):

    • The SVES was launched in 1992 following the Fourth SAARC Summit (1988).
    • It aims to promote regional cooperation and people-to-people contact among 8 SAARC member states by allowing certain categories of individuals to travel without a visa.
    • Eligible Categories: SVES covers 24 categories, including dignitaries, judges, parliamentarians, senior officials, businessmen, journalists, and sportspersons.
    • Special visa stickers are issued (by each SAARC member), typically valid for one year, allowing visa-free travel within SAARC countries.

    India’s Provisions under the SVES:

    • Nepal & Bhutan: Citizens do not require a visa to enter India.
    • Pakistani Nationals: Initially allowed for one-year multiple-entry business visas, revised in 2015 for special-category businessmen with three-year visas.
    • Other Nationals: Sri Lankan nationals are eligible for an e-Tourist visa, while Indian citizens do not need a visa for Nepal and Bhutan.
    [UPSC 2016] Increasing cross-border terrorist attacks in India and growing interference in the internal affairs of several member-states by Pakistan are not conducive for the future of SAARC (South Asian Association for Regional Cooperation).” Explain with suitable examples.

    [UPSC 2007] Consider the following statements:

    1. China has the observer’s status at the South Asian Association for Regional Cooperation.

    2. India has the observer’s status at the Shanghai Cooperation Organisation.

    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

     

  • Section 19 of the POCSO Act, 2012

    Why in the News?

    The Supreme Court has agreed to hear a petition regarding the mandatory reporting of sexual activity under Section 19 of the Protection of Children from Sexual Offences (POCSO) Act, 2012.

    About the POCSO Act, 2012:

    • The POCSO Act came into effect on November 14, 2012 (Children’s Day), following India’s ratification of the UN Convention on the Rights of the Child in 1992.
    • Its primary objective is to address offences related to the sexual exploitation and abuse of children, which were previously either not specifically defined or inadequately penalized.
    • According to the Act, a child is defined as any person below the age of 18 years.
    • In 2019, the Act underwent a review and amendment, introducing more stringent punishments (after Nirbhaya Case), including the death penalty, for those committing sexual crimes against children.

    Key Features of the POCSO Act:

    • Definition of a Child: A child is defined as anyone under 18 years of age.
    • Sexual Offences:
      • Penetrative Sexual Assault (Section 3)
      • Sexual Assault (Section 7)
      • Sexual Harassment (Section 11)
      • Using Children for Pornographic Purposes (Section 13)
      • Abetment and Attempt (Sections 16-18)
    • Special Courts & Procedures: Establishes Special Courts for speedy trials and mandates child-friendly procedures.
    • Protection of Identity: The identity of the child is protected throughout the process.
    • Rehabilitation & Compensation: Provides for the rehabilitation of child victims.
    • No Delay in Trials: Trials must be completed within one year of the offence.

    Recent Supreme Court Hearing:

    • Litigants have raised concerns that mandatory reporting under Section 19 might criminalize consensual sexual activity between juveniles, especially affecting adolescent girls’ right to health.
    • They emphasized counseling over criminalization, arguing that the law might discourage adolescents from seeking medical care.
    • The Supreme Court acknowledged these concerns and scheduled a detailed hearing on May 8 to address them.
    [UPSC 2017] Which of the following are envisaged by the Right against Exploitation in the Constitution of India?

    1. Prohibition of traffic in human beings and forced labour

    2. Abolition of untouchability

    3. Protection of the interests of minorities

    4. Prohibition of employment of children in factories and mines.

    Select the correct answer using the code given below:

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

     

  • [pib] Measuring Helium Abundance in the Sun

    Why in the News?

    Researchers at the Indian Institute of Astrophysics (IIA) have successfully estimated the abundance of Helium in the Sun’s photosphere with precision for the first time.

    [pib] Measuring Helium Abundance in the Sun

    About Helium in the Sun’s Photosphere:

    • Helium is the second most abundant element in the Sun after Hydrogen and plays a key role in understanding solar composition, opacity, and energy transport.
    • However, measuring its precise abundance in the Sun’s photosphere has been challenging due to the absence of observable Helium spectral lines in visible light.
    • Traditionally, Helium abundance was estimated using indirect methods like extrapolating data from hotter stars, solar wind observations, and seismological studies of the Sun’s interior.
    • These methods lacked direct photospheric observations, making the estimates less accurate.
    • Accurate measurements of Helium are essential for modelling the Sun’s opacity and energy transport. This also has broader implications for understanding the composition of other stars.

    Novel Method Recently Discovered:

    • Researchers from the IIA introduced a novel method to directly estimate Helium abundance in the Sun’s photosphere.
    • This technique uses spectral features from Magnesium (Mg) and Carbon (C), overcoming the challenge of no direct Helium spectral lines.
    • Spectral lines from Mg, C, and hydrogenated molecules (MgH, CH, C2) were used to infer Helium abundance.
    • Equivalent Width analyses and spectrum synthesis techniques helped model the behavior of these elements in varying Helium-to-Hydrogen ratios.
    • The Helium-to-Hydrogen ratio in the Sun’s photosphere was found to be 0.1, consistent with previous studies. This confirms the validity of the new method.
    [UPSC 2023] Diffusion of light in the atmosphere takes place due to:

    Options: (a) Carbon dioxide (b) Dust particles* (c) Helium (d) Water vapors

     

  • [24th April 2025] The Hindu Op-ed: Responding to the terror attack in Pahalgam

    PYQ Relevance:

    [UPSC 2024] Winning of ‘Hearts and Minds’ in terrorism-affected areas is an essential step in restoring the trust of the population. Discuss the measures adopted by the Government in this respect as part of the conflict resolution in Jammu and Kashmir.

    Linkage: The Pahalgam attack occurred in Jammu and Kashmir. This question directly addresses strategies for building trust and resolving conflict in terrorism-affected regions, which is a crucial aspect of responding to such attacks in the long term.

     

    Mentor’s Comment:  The terrorist attack in Pahalgam, Jammu and Kashmir, is not just an act of violence; it’s a calculated political move, carefully timed to cause both human casualties and strategic disruption. The attack took place shortly after the Kashmir Valley started welcoming tourists for the season and while U.S. Vice-President J.D. Vance was visiting India. This is not a random attack, but part of a long-standing pattern of cross-border terrorism supported by Pakistan’s military and intelligence agencies. At a time when Pakistan had faded from India’s diplomatic focus, it has now returned, aiming to disrupt what India holds dear.

    Today’s editorial analyzes the recent terrorist attack in the Baisaran meadows of Pahalgam, Jammu and Kashmir. This discussion will be useful for GS Paper 2 on International Relations and GS Paper 3 on Border Management.

    _

    Let’s learn!

    Why in the News?

    On April 22, 2025, terrorists attacked a group of tourists in the Baisaran meadows of Pahalgam, Jammu and Kashmir, killing dozens and injuring many others. This was the first major attack on civilians in Kashmir since the government removed the region’s special status in 2019.

    Why is the Pahalgam attack seen as a political signal beyond terrorism?

    • Strategic Timing: The attack was carefully timed to coincide with major diplomatic events, aiming to internationalize the Kashmir issue and undermine India’s global image. Eg: It occurred during U.S. Vice-President J.D. Vance’s visit to India, drawing global attention and signaling instability in Kashmir.
    • Undermining Normalcy: Targeting a tourist destination was meant to damage the perception of peace, hurt local livelihoods, and instill fear among potential visitors. Eg: The attack happened in Baisaran near Pahalgam, a scenic spot often described as ‘mini Switzerland’, during peak tourism season.
    • Proxy Warfare: It reflects Pakistan’s continued reliance on non-state actors to wage asymmetric warfare against India while maintaining deniability. Eg: The Resistance Front (TRF), linked to Lashkar-e-Taiba and ISI, claimed responsibility—mirroring past attacks like the 2019 Pulwama bombing.

    What intelligence and security lapses does the attack reveal?

    • Failure of Local Intelligence Gathering: Security forces lacked timely and actionable intelligence about militant movement in a high-tourist zone. Eg: Despite a large number of tourists in Pahalgam, there were no alerts about possible threats in the area prior to the attack.
    • Inadequate Perimeter Surveillance: The attackers exploited gaps in area surveillance and patrol routines around tourist spots. Eg: The militants attacked near Baisaran meadow—an open and vulnerable area with limited surveillance despite being a tourist hotspot.
    • Weak Coordination Among Agencies: Lack of seamless coordination between intelligence, police, and paramilitary forces led to poor threat anticipation and response. Eg: Local police reportedly had not received central alerts, reflecting weak inter-agency information sharing.
    • Overreliance on Static Security Checks: Security was concentrated at checkpoints, but attackers used off-road routes to bypass these. Eg: Militants avoided heavily guarded roads and struck a moving vehicle, indicating knowledge of patrol patterns.
    • Neglect of Civilian Vulnerability Mapping: No dynamic assessment of soft targets such as unescorted tourist groups in sensitive areas. Eg: The victims were on a pony ride, unprotected, with no security escort in a forested zone open to ambush.

    How does Pakistan’s instability under Gen. Munir fuel cross-border terrorism?

    • Military-Civil Power Struggle: The weakening of civilian institutions and dominance of the military creates an environment where the Army uses external conflicts to maintain control. Eg: Gen. Munir’s growing influence post-Imran Khan’s ousting has coincided with increased militant activity in Kashmir to divert attention from domestic unrest.
    • Use of Terrorism as Strategic Depth: The Pakistani military views proxy groups as tools to counterbalance India without engaging in direct war. Eg: Groups like Lashkar-e-Taiba and Jaish-e-Mohammed have resurged in training and logistics activities near the LoC.
    • Diverting Attention from Internal Crises: Facing economic collapse and political chaos, Pakistan’s deep state stokes tensions with India to unify the populace and distract from internal failures. Eg: After IMF bailout troubles and mass protests, there was a spike in infiltration attempts into J&K.
    • Weak Civilian Oversight on Terror Networks: Political instability weakens civilian checks on terror outfits, allowing the military and ISI to operate with impunity. Eg: Banned terror outfits continue to function under new names and operate training camps openly in PoK and Punjab regions.
    • ISI’s Tactical Shift Toward Lone Wolf or Hybrid Militants: The ISI, under Munir’s tenure as ex-ISI chief, has adapted to deploy hard-to-trace, localised operatives, making it harder for India to track networks. Eg: Attacks like Pahalgam have shown signs of hybrid militancy—locals radicalised online but supported logistically from across the border.

    How can India align its external stance with internal outreach in Kashmir?

    • Promote Development as a Security Strategy: Emphasize infrastructure, education, and employment to win hearts locally and showcase progress internationally. Eg: The Srinagar Smart City project and new medical colleges can be highlighted in diplomatic forums to counter negative narratives.
    • Empower Local Governance: Strengthen democratic institutions like Panchayats and urban bodies to demonstrate political normalization. Eg: Conducting timely local body elections and empowering DDCs reflects ground-level participation, reinforcing India’s democratic image globally.
    • Consistent Narrative Management: Maintain a unified communication strategy to counter misinformation from hostile actors. Eg: India’s MEA and J&K administration issuing joint statements during crises can reduce confusion and reinforce India’s position internationally.
    • Engage Diaspora and Global Media: Leverage Indian diaspora and media outreach to project a balanced narrative on Kashmir reforms and security. Eg: Indian embassies organizing Kashmir-focused briefings in the US/EU to highlight post-Article 370 investments and peace-building.
    • Cultural and Religious Diplomacy: Promote Kashmir’s syncretic traditions like Sufism to counter radical narratives. Eg: Organizing international Sufi festivals or Buddhist circuit promotion in Ladakh can portray Kashmir as culturally inclusive and peaceful.

    What steps has taken by the Indian Government?

    • Diplomatic Measures: India has downgraded its diplomatic and logistical ties with Pakistan.Eg: The Indus Waters Treaty has been suspended, the Attari-Wagah border crossing has been closed, and Pakistani defense advisors have been expelled. Additionally, Pakistani nationals in India under regional visas have been given 48 hours to leave, and India’s embassy staff in Islamabad has been reduced.
    • Security Enhancements: The Indian government has increased security measures in Jammu and Kashmir. Eg: Security forces are conducting a major manhunt in the region to apprehend the perpetrators of the attack. The government is also reviewing and strengthening security protocols to prevent future incidents.

    Way forward: 

    • Enhanced Security Infrastructure: Strengthen intelligence networks and surveillance systems in vulnerable regions like Jammu and Kashmir to preempt cross-border terrorism and ensure rapid response capabilities.
    • Diplomatic Pressure on Pakistan: Intensify international diplomatic efforts to isolate Pakistan by leveraging global platforms, pressing for accountability, and fostering stronger alliances to counter terrorism.

  • Air pollution in India — where does it come from?

    Why in the News?

    Millions of people die early because of dirty air. But where does this air pollution come from?

    Where do the majority of sulphur dioxide (SO2) emissions in India come from?

    • Energy Production: The largest source of sulphur dioxide (SO2) emissions in India is energy production, primarily from coal-fired power plants. Eg, coal contains sulphur impurities that are released when it is burned, contributing significantly to SO2 pollution.
    • Industrial Activities: Industries like cement production, steel manufacturing, and chemical plants also release SO2. Eg, the cement industry, which uses fossil fuels, is a major emitter of this pollutant.

    What are the main sources of nitrogen oxides (NOx) emissions?

    • Transportation: The largest source of nitrogen oxides (NOx) emissions is transportation, particularly from the exhaust of cars and trucks. Eg, diesel-powered vehicles, which burn fuel less efficiently, produce higher NOx emissions.
    • Energy Production: The burning of coal and gas for electricity generation also significantly contributes to NOx emissions. Eg, power plants that burn coal release large amounts of NOx during the combustion process.
    • Industrial Activities: Industrial processes such as manufacturing and chemical production also emit NOx. Eg, refineries and other heavy industries use high-temperature processes that release NOx as a byproduct.

    What sectors are the biggest contributors to methane (CH4) emissions?

    • Agriculture: The largest source of methane emissions, particularly from livestock digestion (enteric fermentation) and rice paddies. Eg, cows and other ruminants produce methane during digestion, and flooded rice fields emit methane as organic matter decomposes anaerobically.
    • Waste Management: Methane is released from organic waste decomposing in landfills under anaerobic conditions. Eg, food waste rotting in landfills produces significant methane emissions.
    • Fossil Fuel Extraction: Methane is emitted during the extraction, transport, and use of fossil fuels, especially natural gas. Eg, methane leaks from oil and gas pipelines, as well as from coal mines, contributing to atmospheric emissions.

    How does agriculture contribute to ammonia (NH3) emissions and their health impacts?

    • Agriculture: The application of nitrogen-based fertilizers is a major source of ammonia emissions. Eg, the use of urea fertilizers in crop fields results in ammonia volatilization when applied to the soil, contributing to air pollution.
    • Livestock Waste: Ammonia is released from animal manure, especially from large-scale livestock farming. Eg, in intensive dairy and poultry farms, ammonia is emitted from urine and feces, leading to air and water pollution.
    • Health Impacts: Ammonia contributes to the formation of fine particulate matter (PM2.5), which can cause respiratory issues, asthma, and premature deaths. Eg, exposure to ammonia-laden air in farming areas has been linked to increased health risks such as lung diseases and cardiovascular problems.

    What are the steps taken by the Indian Government?

    • National Clean Air Programme (NCAP): Launched in 2019, NCAP aims to reduce particulate matter (PM2.5 and PM10) pollution in 102 cities by 20-30% by 2024, with strategies focusing on controlling emissions from key sectors like transport, industries, and construction.
    • Pradhan Mantri Ujjwala Yojana: This initiative aims to replace traditional biomass cooking methods with clean cooking technologies, such as LPG, to reduce black carbon emissions in rural areas.
    • BS-VI Norms for Vehicles: The Indian government has enforced the Bharat Stage VI (BS-VI) emission standards from April 2020, which are aimed at significantly reducing nitrogen oxides (NOx) and particulate emissions from vehicles.
    • Pollution Control Measures in Power Plants: The government has set deadlines for coal-fired power plants to comply with stricter emission norms for sulphur dioxide (SO2), nitrogen oxides (NOx), and particulate matter.
    • Air Quality Monitoring and Data Collection: The government has set up a network of air quality monitoring stations across cities under the Central Pollution Control Board (CPCB) and is working to improve real-time data collection on air quality.

    Way forward: 

    • Shift to Clean Energy: Expand renewable energy use and enforce cleaner technologies in the power and industrial sectors to cut SO₂ and NOₓ emissions.
    • Strengthen Enforcement & Awareness: Ensure strict implementation of air quality norms and raise public awareness on pollution-reducing practices.

    Mains PYQ:

    [UPSC 2022] Discuss in detail the photochemical smog, emphasising its formation, effects and mitigation.

    Linkage: Formation of a significant type of air pollution, photochemical smog, which is formed from primary pollutants like Nitrogen oxides (from transport and industry) reacting in the presence of sunlight [209, external knowledge]. Understanding the formation requires knowing the precursor pollutants and their sources.