Context:
The Delhi Government, in collaboration with IIT-Madras, is testing photocatalytic “smog-eating” coatings using titanium dioxide (TiO₂) to reduce urban air pollution.
Key Highlights:
- Government Initiative / Scientific Study
- Six-month project launched (March 2026).
- Focus on reducing NO₂ and VOCs using innovative coatings.
- Led by IIT-Madras (Prof. Somnath C Roy).
- Scientific Principle
- Based on photocatalysis:
- TiO₂ reacts under sunlight, generating electrons.
- Breaks pollutants into less harmful substances.
- Implementation Strategy
- Application methods:
- Mixed in concrete/asphalt
- Applied as coatings or panels
- Testing under simulated smog conditions using real data.
- Environmental Significance
- Targets urban pollution hotspots like roads and buildings.
- Offers low-cost, scalable solution for air quality improvement.
Relevant Prelims Points:
- Photocatalysis: Light-driven chemical reaction.
- Titanium Dioxide (TiO₂): Semiconductor used as catalyst.
- NO₂: Toxic gas from vehicles and industries.
- VOCs: Organic pollutants contributing to smog formation.
Relevant Mains Points:
- Urban Pollution Challenge:
- Delhi faces severe air quality issues (PM2.5, NOx, VOCs).
- Technological Innovation:
- Use of nanotechnology and materials science in environmental management.
- Advantages:
- Passive, continuous pollutant reduction.
- Can be integrated into existing infrastructure.
- Challenges:
- Effectiveness depends on sunlight availability.
- Durability and maintenance issues.
- Limited impact on high pollution loads.
- Way Forward
- Scale up after pilot validation.
- Combine with other pollution control measures.
- Promote urban green infrastructure integration.
UPSC Relevance:
- GS 3: Environment, Science & Technology