A Clean Road Doesn't Always Mean Clean Air: How 3 Indian Cities Are Tackling Road Dust

Road dust is loose soil, debris and fine particles that collect on road surfaces and shoulders. Some of it can contain PM10, particles measuring 10 micrometres or less. The problem is not only how dirty a road looks. It is whether cleaning removes fine material or merely moves it around.

Vehicles can disturb dust left between paving, along edges or on imperfect surfaces. Their movement sends the remaining material upward, where pedestrians, cyclists and nearby residents may breathe it. A road can therefore appear spotless while still contributing to airborne pollution.

This is why the article focuses on preventing dust from becoming airborne. Mechanised sweepers can collect debris and use suction for finer material. Paving, repairing damaged surfaces and cleaning road shoulders can reduce the amount available for vehicles to resuspend. Effective control requires removal and prevention, not just more frequent sweeping.

The three cities address road dust at different points in the problem. Lucknow focuses on removing accumulated material and reducing exposed road surfaces. Parwanoo targets the damaged roads and drainage conditions that allow dust to form or collect. Chandigarh is testing whether washing and mechanical cleaning can work together.

Lucknow deployed 97 electric mechanised sweeping machines and paved about 559.85 kilometres of roads end-to-end. Parwanoo upgraded 9 kilometres with paver blocks and interlocking tiles, improved drainage and monitored construction waste. Chandigarh planned treated-water washing, mechanised sweeping and cleaning of road shoulders on a dust-prone corridor.

Their results are not equally established. Lucknow received recognition, but the article says the award does not prove the size of pollution reductions. Parwanoo recorded a PM10 decline alongside several interventions. Chandigarh remains a pilot, with monitoring intended to guide any wider expansion.

The interventions range from citywide equipment and paving to a focused pilot. Their scale matters because road dust is produced across streets, edges and damaged surfaces. A local clean-up may help one corridor, while broad paving or sweeping can address a much larger network.

Lucknow used 97 electric mechanised sweeping machines and paved approximately 559.85 kilometres of roads end-to-end. Parwanoo upgraded a 9-kilometre road stretch with paver blocks and interlocking tiles. It also created a 0.27-acre green buffer zone. Chandigarh’s project covered a dust-prone road corridor, combining washing, sweeping and shoulder cleaning.

These figures show different strategies rather than a single standard model. Lucknow operated at city scale, Parwanoo concentrated on physical repairs and Chandigarh tested a method before possible expansion. Chandigarh planned PM10 monitoring, while the article cautions that Lucknow’s recognition does not measure the precise effect of individual actions.

When vehicles repeatedly lift fine road dust, pollution shifts from the ground into the air people breathe. The article identifies pedestrians, cyclists and residents as exposed groups. The concern is especially important for fine particles, because they can travel in the air rather than staying visible on the road.

PM10 means particles 10 micrometres or less in diameter. The article notes that road dust can contain PM10 and that these particles can enter the respiratory system. A clean-looking road may therefore still create exposure if sweeping leaves fine material behind or if shoulders remain dusty.

The source does not provide figures for illness or a direct health study of these interventions. It does show why dust control matters beyond appearance. Reducing loose material, repairing surfaces and checking PM10 levels can help cities judge whether their actions are reducing airborne exposure rather than simply improving cleanliness.

Road dust is often created or renewed by conditions around the road. Damaged surfaces can crumble, poor drainage can cause erosion, and loose soil or debris on shoulders can be disturbed by traffic. Construction and demolition waste, uncovered stockpiles and open garbage dumping add further sources.

The cities used several controls. Parwanoo repaired roads, improved drainage, scrutinised construction and demolition waste, planted vegetation and curbed open dumping. Chandigarh planned shoulder cleaning and directed agencies to cover loose soil, use vegetation and apply sprinklers or anti-smog guns where appropriate. Lucknow’s wider effort also addressed vehicle emissions and waste burning.

These measures show that municipalities can manage both the material and the conditions that spread it. Cleaning the carriageway alone may leave edge dust or construction debris untouched. Source control becomes broader when cities inspect worksites, maintain drainage, pave exposed areas and reduce other pollution sources.

Sweeping removes dust after it has accumulated, but it does not necessarily stop new dust from forming. Crumbling surfaces shed material, while poor drainage can cause erosion. Construction and demolition waste can also add loose particles. If these sources remain, frequent sweeping treats the symptom again and again.

Parwanoo repaired a 9-kilometre stretch with paver blocks and interlocking tiles. It improved drainage, inspected construction and demolition waste, created a green buffer and curbed open dumping. Its annual average PM10 concentration fell from 66 micrograms per cubic metre in 2017-18 to 39 in 2023-24. The article says several interventions contributed, not paving alone.

Source control can therefore make cleaning more durable. A sound surface produces less loose material, drainage limits erosion, and managed waste reduces fresh deposits. Sweeping still has a role, but repairing the causes may reduce the amount that needs to be collected and the risk of resuspension.

PM10 refers to particles with a diameter of 10 micrometres or less. The article links these particles to road dust and notes that they can enter the respiratory system. A city’s air quality reflects the amount of such pollution in the air, measured through indicators such as PM10 and the AQI.

Traffic can disturb dust left on roads and shoulders. Damaged surfaces, erosion and construction waste can supply more particles. Weather affects how pollution behaves: moving air can disperse it, while stagnant conditions can allow it to build up. These weather effects are established air-quality principles, while the article specifically documents vehicle resuspension and dust sources.

The final reading reflects these forces together, not one action alone. Parwanoo’s PM10 average fell after several interventions, but the article does not assign the change to paving alone. Chandigarh planned PM10 monitoring so officials could test whether washing, sweeping and shoulder cleaning improved air quality.