Context
-
- The Commission for Air Quality Management (CAQM) is discussing with ISRO and Punjab-Haryana authorities ways to improve the measurement and “ground truthing” of stubble-burning fires.
- Satellite-based fire counts may not accurately capture the actual extent of farm fires, creating challenges in assessing their contribution to Delhi-NCR air pollution.
- The issue becomes particularly important before the winter pollution season in the Delhi-NCR.
Why are Farm Fires Important?
-
- Stubble burning in Punjab and Haryana is a major contributor to air pollution during certain weeks of October-November.
- During this period, paddy stubble is frequently burned to clear fields for wheat sowing.
- Farm fires can contribute up to 44% of particulate matter pollution on certain weeks, according to studies cited in the report.
- However, overall winter pollution is multi-source, involving vehicles, industry, agricultural waste, firecrackers and weather conditions.
Role of ISRO & Satellite Monitoring
-
- Fire counts are increasingly monitored through satellite sensors.
- ISRO’s space-based observations can help:
- Improve detection of farm fires.
- Identify changing fire patterns.
- Support evidence-based policymaking.
- Improve ground verification of satellite observations.
- An ISRO Space Applications Centre study found a shift in peak fire activity from around 1:30 p.m. in 2020 to around 5 p.m. in 2024, allegedly to avoid detection by polar-orbiting satellites.
Key Challenge
Satellite sensors cannot independently measure factors such as:
Straw quantity + Moisture + Combustion efficiency + Pollutant emission factors
Therefore:
Fire count ≠ Actual pollution contribution
Governance Significance
-
- Highlights the importance of scientific evidence in environmental governance.
- Better measurement can improve accountability and policy targeting.
- Prevents dependence on inaccurate or incomplete estimates.
- Strengthens Centre-State-Scientific institution coordination.
Way Forward
-
- Strengthen satellite + ground-based monitoring.
- Develop better emission-estimation protocols.
- Promote alternatives to stubble burning and improve residue management.
- Use real-time, transparent and scientifically validated data for policy decisions.
Conclusion
Effective air-pollution management requires moving from counting fires to accurately measuring their actual pollution impact. Integrating ISRO’s satellite capabilities with ground verification can make India’s environmental governance more scientific, targeted and evidence-based.
Spread the Word