6 months ago
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Road particulate chiefly comprises PM₁₀ and coarse particles and forms a ample stock of the aerial we breathe. With the National Clean Air Programme (NCAP) aiming for a 40% simplification successful PM₁₀ by 2025-2026, reducing roadworthy particulate is an urgent priority.
This is reinforced by root apportionment studies crossed 17 non-attainment cities that person recovered roadworthy particulate to beryllium a large contributor to PM10 (20-52%) arsenic good arsenic PM2.5 (8-25%) particles. IIT-Delhi researchers person besides recorded that streets successful 32 cities crossed Himachal Pradesh, Punjab, Rajasthan, Uttar Pradesh, and Telangana alteration wide vis-à-vis their silt loads, from 0.2 g/m2 to 111.2 g/m²; Delhi averages 14.47 g/m².
Overall, cities successful North India person heavier silt loads and are frankincense dustier than their confederate counterparts.
In response, governments person already invested heavy successful warring dust. Per a 2024 reportby the Centre for Science and Environment, ₹19,711 crore was allocated to 131 cities betwixt 2019 and 2025 nether the NCAP to amended aerial quality. By November 2023, astir 64% of the full money had been spent connected roadworthy particulate control, acold much than what was spent connected tackling biomass burning, vehicular pollution, and capacity-building efforts.
While this suggests that there’s a prioritisation, it’s indispensable to measure effectiveness connected the ground.
Policy landscape
Efforts to power roadworthy particulate person been underway for respective years. In January 2018, the Union Environment Ministry issued a notification to mitigate particulate astatine operation sites, mandating paving and blacktopping of roads starring up to specified sites. In 2021, the Commission for Air Quality Management successful the National Capital Region and Adjoining Areas (CAQM) recommended the constitution of ‘Dust Control and Management Cells’. Following statutory directions from the CAQM, 68 Cells were acceptable up to undertake a broad acceptable of actions, including identifying particulate hotspots, paving and repairing roads and roadsides, greening cardinal verges and roadsides, and deploying mechanised road-sweeping machines and anti-smog guns. The CAQM periodically reviews these activities. However, particulate from roads and unfastened areas remains a large operator of mediocre aerial prime successful Delhi-NCR.
To fortify its approach, the CAQM initiated a survey called ‘Addressing vehicular traffic-induced roadworthy particulate resuspension for aerial prime enactment plans’ successful 2025. In the aviator phase, 24% of 82 km of assessed roadworthy magnitude was recovered to beryllium successful mediocre condition, 42% moderate, and 34% good. The CAQM besides acceptable up a committee to make a ‘Standard Framework for Controlling Dust Pollution from Roads and Open Areas’.
Both initiatives recommended aggregate activities, including paving and greening, for the NCR states arsenic good arsenic further steps specified arsenic integer mapping of each roads successful Delhi-NCR and conducting broad roadworthy information surveys.
As is evident, these efforts were focused connected Delhi-NCR whereas akin measures and organization mechanisms are needed crossed India. Indeed, the Environment (Protection) Act 1986 and the Air (Prevention and Control of Pollution) Act 1981 marque wide references to roadworthy particulate management. The Construction and Demolition Waste Management Rules 2025 don’t outline circumstantial regulations addressing roadworthy particulate power astatine the nationalist scale, however. There are besides nary modular operating procedures to scientifically dispose of the particulate collected by manual and mechanised sweeping to forestall resuspension.
Jurisdictional puzzle
While the NCAP, the CAQM guidelines, and metropolis enactment plans prioritise power options specified arsenic paving roads and roadsides, sprinkling water, and truthful on, the outcomes stay uneven. Even with 64% of the full NCAP money spent connected roadworthy repair and maintenance, 29 cities person reported an summation successful PM10 concentrations. Of the 68 cities wherever the section PM10 attraction dropped, 61 were supra the National Ambient Air Quality Standards, pointing to the constricted effectiveness of extant interventions.
One large situation is fragmented jurisdiction. Under the NCAP, municipal corporations and State Pollution Control Boards are required to curb roadworthy dust. In practice, however, the work is divided crossed aggregate agencies. In Delhi, 12 agencies — including the Municipal Corporation, the Delhi Development Authority, the Central Public Works Department, and the National Highways Authority of India — support roads. Similarly, 18 agencies are progressive successful Uttar Pradesh, 22 successful Haryana, and 16 successful Rajasthan. Without intelligibly demarcated roles, funds and accountability go diffused.
Operational constraints adhd to the problem. Of Delhi’s full roadworthy magnitude of 19,000 km, lone 8,000 km has been identified for mechanised sweeping. Around 200 mechanised road-sweeping machines (each operating astatine 40 km/hr) are required to cleanable this agelong each day. Yet the fig of specified machines successful Delhi is lone 85. This spread is overmuch wider successful different cities, underscoring the request to decently estimation roadworthy magnitude and for instrumentality mapping.
Road particulate absorption guidelines should besides beryllium established to specify the due benignant of cleaning and attraction machinery based connected roadworthy width, aboveground type, postulation conditions, debris characteristics, h2o availability, and seasonal variations.
Finally, to guarantee agencies coordinate better, a GIS-based level should beryllium created to let them to show and resoluteness complaints successful real-time, frankincense improving accountability. Such a strategy tin beryllium integrated with existing applications, specified arsenic the Green Delhi App and Swachhata App, to amended coordination and response.
Practical measures
Dust contamination is chiefly caused by unscientific practices during roadworthy improvement and maintenance. The collected particulate is typically discarded successful landfills oregon connected roadsides, wherefrom the upwind easy carries it backmost into cities, rendering the full sweeping process ineffective.
Dust suppressant chemicals specified arsenic calcium chloride, magnesium chloride, and earthy polymer-based agents (e.g. lignosulphate and bitumen-based emulsions) are wide available. However, their effectiveness and interaction connected ungraded and roadworthy wellness aren’t good documented. We request scientifically informed mitigation strategies, including guidelines for utilizing particulate suppressants and technological disposal mechanisms for collection.
Addressing roadworthy and open-area particulate crossed India volition necessitate a holistic and time-bound approach, embedded wrong a long-term, sustainable municipality readying framework. A comprehensive, science-based regulatory mechanics for cleaner roadworthy operation and maintenance, considering unfastened roadsides and aerial prime arsenic captious components of infrastructure improvement plans, is essential.
Thoughtfully designed and consistently implemented particulate power strategies tin importantly heighten aerial quality, support nationalist health, and assistance physique much resilient and liveable cities.
Charu Tyagi is simply a elder subordinate and Swagata Dey heads the Air Quality Policy and Outreach team, some astatine the Center for Study of Science, Technology and Policy (CSTEP), a research-based deliberation tank.
