Subject: Conservation & Mitigation

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.

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.

Why in the News?

A new study by researchers Sujit Raghunathrao Jagadale and Javed M. Shaikh from IIM Amritsar looks at the issue of stubble burning by examining how government policies and market systems are failing to manage the problem effectively.

Why do farmers continue stubble burning despite its harm to air quality?

• Cost-Effective Method: Stubble burning is the cheapest way for farmers to clear their fields after harvesting. Eg: Farmers burn stubble to quickly prepare their land for the next crop, especially for wheat, without incurring high labor or machinery costs.
• Lack of Affordable Alternatives: There are limited affordable and efficient alternatives to stubble burning. Eg: Farmers often do not have access to technology or subsidies for machines that can manage stubble, such as Happy Seeder or bio-decomposers.
• Government’s Focus on High-Yield Crops: The Minimum Support Price (MSP) policy incentivizes the cultivation of wheat and rice, leading to monocropping. Eg: Farmers are encouraged to grow rice continuously, which results in an abundance of stubble that needs to be disposed of quickly.
• Debt and Economic Pressure: Many farmers face financial pressures, including debt and low returns on their crops, which makes burning stubble a way to save time and money. Eg: Farmers often sell their crops to middlemen at low prices, leaving them with insufficient income to invest in sustainable farming practices.
• Lack of Strong Enforcement or Support: Although stubble burning is penalized, enforcement of laws is weak, and farmers often feel the state does not provide adequate support for eco-friendly methods. Eg: Despite penalties, farmers feel little pressure to change practices when there is insufficient governmental support or infrastructure for alternatives.

How does India’s MSP policy influence stubble burning?

• Encourages Monocropping: The MSP policy promotes the cultivation of high-yield crops like rice and wheat, leading to monocropping, which results in a large amount of stubble that must be cleared. Eg: Farmers in Punjab often grow rice followed by wheat, creating a cycle where large quantities of rice stubble need to be burned to prepare the soil for the next crop.
• Limits Crop Diversification: The MSP system prioritizes wheat and rice over other crops, making it economically unfeasible for farmers to switch to more sustainable practices or crops that would reduce stubble burning. Eg: Despite the potential for growing other crops, farmers focus on rice and wheat to benefit from MSP, leaving them with stubble that they have no economically viable option to manage.
• Financial Constraints: The MSP rates for crops like rice and wheat have remained stagnant, making it harder for farmers to invest in alternatives to stubble burning, such as machinery or composting. Eg: With wheat MSP seeing only minimal increases, farmers struggle to cover costs for labor and inputs, leading them to resort to stubble burning as the most cost-effective option to clear fields.

Way forward: 

• Promote Crop Diversification: Encourage farmers to shift from paddy to less water-intensive and non-stubble-generating crops through assured procurement and better MSP for alternative crops. Eg: Incentivize crops like millets and pulses to reduce stubble generation.
• Strengthen Support and Infrastructure: Scale up access to sustainable stubble management technologies and ensure timely financial and logistic support to small and marginal farmers. Eg: Expand reach of Happy Seeder and bio-decomposer solutions through local cooperatives and custom hiring centers.

Mains PYQ:

 [UPSC 2015] Mumbai, Delhi and Kolkata are the three Mega cities of the country but the air pollution is much more serious probelm in Delhi as compared to the other two. Why is this so?

Linkage: Delhi’s severe air pollution, especially at certain times of the year, is caused by a combination of its location in the Indo-Gangetic Plain, nearby states burning crop stubble, and weather conditions that trap pollutants.