Where does road dust settle in India’s efforts to clean its air?, PgII

Key Highlights:

• Road dust, comprising mainly PM₁₀ and coarse particles, significantly contributes to air pollution in India.
• The National Clean Air Programme (NCAP) aims for a 40% reduction in PM₁₀ by 2025-2026, prioritizing road dust reduction.
• A 2024 report indicates that ₹19,711 crore was allocated to 131 cities under NCAP between 2019 and 2025, with 64% spent on road dust control.
• The Commission for Air Quality Management (CAQM) has initiated studies and set up committees to control road dust in the National Capital Region (NCR).

Detailed Insights:

• Source apportionment studies across 17 non-attainment cities reveal that road dust contributes significantly to PM10 (20-52%) and PM2.5 (8-25%) particles.
• IIT-Delhi researchers found that silt loads vary widely across streets in 32 cities in Himachal Pradesh, Punjab, Rajasthan, Uttar Pradesh, and Telangana, with northern cities generally having heavier silt loads.
• Despite significant investment in road repair and maintenance under NCAP, 29 cities have reported an increase in PM10 concentrations, indicating limited effectiveness of current interventions.
• Fragmented jurisdiction, with multiple agencies responsible for road maintenance, diffuses accountability and hinders effective road dust control.
• Practical measures such as using dust suppressant chemicals and scientific disposal mechanisms for collected dust are needed for effective road dust management.
• A GIS-based platform for real-time monitoring and complaint resolution can improve coordination and accountability among agencies involved in road dust control.
• A comprehensive, science-based regulatory mechanism for cleaner road construction and maintenance is essential for enhancing air quality and public health.

Key Concepts Involved:

• PM₁₀: Particulate matter with a diameter of 10 micrometers or less, posing respiratory health risks.
• NCAP: A national program to reduce air pollution in Indian cities with specific reduction targets.
• Source Apportionment: Identifying and quantifying the sources of air pollutants in a specific area.
• GIS: A system designed to capture, store, analyze, and manage spatial or geographic data.