Why cloud seeding is not a solution to Delhi’s air pollution crisis, Pg13.

Key Highlights:

• Delhi’s air becomes severely polluted in the post-monsoon and winter months due to stagnant winds and trapped pollutants.
• The government’s plan to use cloud seeding aims to induce artificial rain to wash away pollutants.
• Experts say it cannot create rain without natural clouds and provides, at best, short-term and uncertain reduction in pollution levels.
• Long-term effects on ecosystems, soil, and water bodies remain poorly understood.
• The crisis demands structural solutions — better transport, waste management, and sustainable energy — not short-term fixes.

Detailed Insights:

• Why Delhi’s Air Worsens in Winter:
  • Cooler air holds less water vapour, and stable, high-pressure systems suppress cloud formation.
  • Continental winds from the northwest trap pollutants over the region, worsening air quality.
  • Low temperatures increase particulate concentration as pollutants fail to disperse.
• Scientific Limitations of Cloud Seeding:
  • Relies on existing rain-bearing clouds, which are rare in Delhi’s dry winter atmosphere.
  • Evidence of success is weak and inconsistent globally. Rainfall induced is limited, brief, and spatially unpredictable.
  • The process involves dispersing chemicals like silver iodide or sodium chloride to trigger condensation — substances that can accumulate in soil and water.
  • Its impact on public health, agriculture, and ecosystems remains uncertain.
• Environmental and Ethical Concerns:
  • Artificial rainfall can cause localized flooding, infrastructure damage, or crop loss if uncoordinated.
  • Raises accountability issues — if rainfall and flooding coincide, who bears responsibility?
  • Diverts attention and resources away from long-term pollution management strategies.
• Root Causes of Delhi’s Pollution:
  • Vehicular emissions, industrial output, thermal power plants, waste burning, and stubble fires are the primary culprits.
  • Urban planning failures, poor public transport, and seasonal inversion layers aggravate the crisis.
  • Structural changes in energy, waste, and mobility sectors are necessary for sustainable air quality improvement.

Scientific/Technical Concepts Involved:

• Cloud Seeding: Artificial enhancement of rainfall by dispersing particles like silver iodide into clouds to induce condensation.
• Temperature Inversion: A meteorological condition where warm air traps pollutants near the ground, worsening smog.
• Aerosols and Particulate Matter: Tiny solid or liquid particles that scatter light and form haze in the absence of strong winds.