CAQM in talks with Punjab, Haryana to improve stubble burning estimation protocol
2-minute summary
The Commission for Air Quality Management (CAQM) is collaborating with ISRO, Punjab, and Haryana to establish robust 'ground-truthing' protocols to improve the estimation of agricultural stubble burning. While official data from Punjab claimed a 90% reduction in farm fires since 2021 based on daytime satellite passes, independent studies revealed a behavioral shift: farmers delayed burning to late afternoon (around 5:00 PM) to evade polar-orbiting satellites that pass at 1:30 PM. Alternative satellite metrics tracking 'burnt area' indicate a much more gradual reduction of about 30% between 2022 and 2025. CAQM aims to move beyond simple active fire counts to a comprehensive protocol incorporating burnt area, straw quantity, moisture, and combustion efficiency to accurately measure winter pollution contributions.
Why it's in the news
The CAQM has initiated talks with ISRO and state governments to develop advanced ground-truthing protocols, addressing critical gaps in satellite-based monitoring where farmers evade detection by burning stubble outside satellite pass windows.
Background and context
Stubble burning in the northwest Indian states of Punjab and Haryana is a major contributor to winter air pollution in the Delhi-National Capital Region (NCR). During October and November, the withdrawal of the southwest monsoon stalls westerly winds, preventing the dispersion of particulate matter. Farmers burn paddy straw to quickly and cheaply clear fields for sowing wheat. Historically, monitoring relied on active fire counts detected via thermal sensors on polar-orbiting satellites during daytime passes. However, regulatory fines led to tactical adaptations, with farmers burning stubble in the evening. This created a discrepancy between official claims of fire reduction and actual air quality indices, highlighting the need for 'burnt area' analysis and physical ground-truthing.
Constitutional provisions
- Article 21 — Interpreted by the Supreme Court to include the right to clean air and a healthy environment as part of the right to life.
- Article 48A — Directive Principle of State Policy directing the State to endeavor to protect and improve the environment.
- Article 51A(g) — Fundamental Duty of every citizen to protect and improve the natural environment.
Government schemes
- Central Sector Scheme on Promotion of Agricultural Mechanization for In-Situ Management of Crop Residue — Provides subsidies for crop residue management machinery like Happy Seeders and Super Straw Management Systems to reduce open burning.
Mains practice: Evaluate the role of the Commission for Air Quality Management (CAQM) in addressing the seasonal air pollution crisis in Delhi-NCR. What are the structural and technological challenges it faces in coordinating with state governments?
The Commission for Air Quality Management (CAQM) was established as a statutory body in 2021 to coordinate, monitor, and prevent air pollution in the Delhi-NCR and adjoining areas. It replaced the older Environment Pollution (Prevention and Control) Authority (EPCA) with enhanced powers to issue binding directions to states.
• **Structural Challenges in Coordination**:
- **Federal Friction**: CAQM relies heavily on state enforcement machinery in Punjab, Haryana, and Uttar Pradesh. Local political dynamics and resistance from farmer unions often dilute the enforcement of fines and 'red-entry' land records.
- **Incentive Mismatch**: While CAQM promotes in-situ and ex-situ crop residue management, the high operational cost of machinery compared to the low cost of burning stubble creates a persistent compliance gap for smallholder farmers.
• **Technological Challenges in Monitoring**:
- **Temporal Evasion**: Farmers have adapted to satellite surveillance by shifting burning times from midday (1:30 PM) to late afternoon (5:00 PM) to bypass polar-orbiting satellite passes, leading to underreported active fire counts.
- **Metric Limitations**: Active fire counts fail to measure the actual physical 'burnt area' or account for variables like straw moisture, quantity, and combustion efficiency, which dictate actual particulate emissions.
To overcome these challenges, CAQM must transition from simple fire-count tracking to robust 'burnt area' estimation in collaboration with ISRO, backed by physical ground-truthing. Ultimately, technological monitoring must be paired with viable economic incentives, such as direct ex-situ crop residue buy-back programs, to achieve lasting compliance.
Prelims practice questions
Q1. With reference to the Commission for Air Quality Management (CAQM), consider the following statements: 1. It is a statutory body established under an Act of Parliament. 2. It has the power to supersede any direction issued by state governments of Punjab and Haryana regarding air quality. 3. Appeals against the decisions of the CAQM lie directly with the Supreme Court of India. Which of the statements given above are correct?
- 1 and 2 only
- 2 and 3 only
- 1 and 3 only
- 1, 2 and 3
Answer: A. Statements 1 and 2 are correct. CAQM is a statutory body with overriding powers over state governments in its jurisdiction. Statement 3 is incorrect because appeals against CAQM orders lie with the National Green Tribunal (NGT), not directly with the Supreme Court.
Q2. In the context of environmental monitoring, how does 'Burnt Area' estimation differ from 'Active Fire Counts'?
- There is no difference; both terms are used interchangeably by ISRO.
- Active Fire Counts are conducted via ground-truthing, whereas Burnt Area is exclusively measured by polar-orbiting satellites.
- Active Fire Counts measure the physical acreage of scarred land, while Burnt Area measures thermal anomalies.
- Burnt Area measures the cumulative physical land acreage affected by fire over time, making it less susceptible to temporal evasion by evening burning.
Answer: D. Burnt Area estimation calculates the actual physical land area scarred by fire, which remains visible on the ground even if the fire was lit outside the specific time window of a satellite pass. Active Fire Counts only register thermal anomalies at the exact moment a satellite passes overhead.
Q3. Which of the following meteorological factors contributes most significantly to the trapping of stubble-burning emissions over Delhi-NCR during October and November?
- Temperature inversion combined with the stalling of westerly winds
- High relative humidity and heavy precipitation
- Strong easterly winds from the Bay of Bengal
- The onset of the southwest monsoon
Answer: A. During October and November, the withdrawal of the southwest monsoon stalls the westerly winds that would normally flush out pollutants. This, combined with falling winter temperatures, causes temperature inversion (where cold air is trapped near the ground under a layer of warm air), locking particulate matter over the Indo-Gangetic Plain.
Revision flashcards
- What is the statutory basis of the CAQM? The Commission for Air Quality Management in National Capital Region and Adjoining Areas Act, 2021.
- Why did official active fire counts underreport stubble burning in Punjab? Farmers shifted burning times to late afternoon (around 5 PM) to avoid detection by polar-orbiting satellites passing at 1:30 PM.
- What is 'ground-truthing' in remote sensing? The collection of direct, on-site physical data to verify and calibrate analysis derived from satellite imagery.
- Which satellite metric provides a more reliable estimate of total crop residue burning than active fire counts? 'Burnt Area' estimation, which measures the actual physical acreage of land affected by fire.
- Where do appeals against the orders of the CAQM lie? The National Green Tribunal (NGT).