Delhi’s war on dust: Why city’s pollution hotspots remain a challenge

Road dust is loose material that collects on roads, pavements, medians and other exposed surfaces. It can include soil, silt and particles from construction or damaged road surfaces. It matters because dust sitting on a road is less harmful than dust suspended in the air people breathe.

Passing vehicles are a major trigger. Their movement stirs settled dust and loose silt back into the air. Construction activity, excavation, uncovered materials, exposed soil and traffic can add more particles. In 2023, an inspection found thick dust layers near the Red Fort, Rajghat, ITO, Pragati Power Plant, IP Estate and Millennium Park.

Mechanical sweeping aims to remove this material before traffic resuspends it. However, the article reports that sweepers covered only 35–40% of Delhi’s large and medium roads on alternate days. Prevention therefore requires cleaner road edges, covered construction materials, repaired roads and removal of collected dust.

Delhi’s dust-control problem is large and spread across many locations. A CAQM assessment found 65 major pollution sources across 13 hotspots. Sixteen were resolved, 43 remained under monitoring and six were pending. Authorities also identified 4,555 minor sources, including road dust, potholes, unpaved roads and construction-waste dumping.

Mechanical sweeping covers only part of the road network. Delhi had nearly 100 machines, although 172 were required. The machines cleaned just 35–40% of large and medium-sized roads on alternate days, against the prescribed norm of covering the entire network. Each machine covered up to 30 kilometres daily, below the required 40 kilometres.

Coverage is further limited by encroachments and illegally parked vehicles. About 70% of Delhi’s roads are narrower than 10 metres and are currently swept manually. The figures show that adding machines alone will not deliver complete dust control.

A pollution hotspot is not an isolated point. Dust can come from nearby roads, construction sites, exposed soil, waste dumping or traffic and then move towards the location receiving cleaning or spraying. Treating only the visible problem leaves the wider pollution system intact.

Delhi’s PWD introduced a strategy in October 2026 to identify and tackle dust sources within a 3-kilometre radius of 47 pollution hotspots. This approach recognises that an anti-smog gun or a cleaned road may have limited effect if excavation, loose soil or uncovered construction material remains nearby. Pollution can continue to arrive from surrounding stretches.

The wider strategy matters because suppression is temporary, while source control can reduce repeated emissions. Authorities still need to fix road conditions, control construction material, stop illegal dumping and maintain cleaning. The article’s figures show that many sources remained under monitoring or pending, so lasting results depend on follow-through.

Delhi’s hotspots usually have several dust sources operating together. Road dust can combine with construction activity, vehicle movement, waste dumping and exposed soil. This makes local pollution harder to control because one source can continue even after another has been addressed.

The Commission for Air Quality Management identified minor sources including road dust, garbage and construction-waste dumping, potholes, unpaved roads, traffic congestion and open waste burning. The article also points to uncovered construction material, excavation, illegal dumping and poor road conditions. These sources can release particles directly or leave loose material for traffic to resuspend.

Authorities identified 4,555 minor pollution sources, and nearly half had been addressed during the reported review. However, the remaining problems show why hotspot action must cover surrounding areas. Cleaning roads, enforcing construction rules, repairing damaged surfaces and preventing dumping need to work together rather than as isolated measures.

The article presents dust control as a shared responsibility rather than the job of one body. Delhi’s civic agencies are expected to clean roads, operate mechanical sweepers and address visible dust. Authorities also need to control construction violations, uncovered material, illegal dumping and poor road conditions.

PWD introduced the October 2026 plan to identify dust sources within 3 kilometres of 47 hotspots. The Commission for Air Quality Management, or CAQM, assessed sweeping coverage and reviewed major and minor pollution sources. The article also refers broadly to government agencies, civic agencies and authorities, while describing anti-smog guns, sprinklers and cleaning drives.

The source does not name every agency or assign each task in detail. It shows that responsibility includes source identification, enforcement, road maintenance, waste control and sustained cleaning. Results will depend on coordination and on fixing problems, not merely deploying equipment after dust becomes visible.

When vehicles repeatedly pass over dusty roads, they resuspend settled particles. This keeps pollution in the air instead of allowing it to remain on the ground. The article describes passing vehicles stirring thick layers of dust and loose silt near several central Delhi locations.

The immediate consequence is poorer local air quality, especially where roads, pavements and footpaths hold accumulated material. Airborne particles can be inhaled. Established health knowledge links particulate exposure with irritation of the eyes and airways and greater respiratory risk, although this article does not provide a health study or quantify those effects.

Repeated resuspension also makes temporary cleaning less effective. If road edges, medians and pavements quickly gather dust again, pollution returns whenever traffic moves. Removing accumulated material, repairing roads, controlling construction and preventing dumping can reduce this cycle more effectively than spraying after the dust is already airborne.

Particulate pollutants are tiny solid or liquid particles suspended in air. PM10 means particles with an aerodynamic diameter of 10 micrometres or less. Road dust, construction material and particles from exposed surfaces can contribute to this category. Because these particles are airborne, people can inhale them.

Water sprinklers and anti-smog guns may make visible dust settle temporarily. Mechanical sweepers remove accumulated material before traffic pushes it back into the air. The article describes this difference through its central question: whether Delhi is controlling sources or merely suppressing pollution after it becomes visible.

Prevention is stronger because it reduces the amount of material available for resuspension. Covered construction material, repaired roads, controlled excavation, cleaner road edges and an end to illegal dumping address causes. The article reports that sweeping reached only 35–40% of large and medium roads, making source control especially important. The PM10 definition comes from established scientific knowledge; the article itself focuses on dust control rather than defining PM10.