NHAI repeats winter dust-control measures, but where is the evidence of improvement?

New Delhi: It is a pretty frustrating news piece to begin with. The National Highways Authority of India (NHAI) on Thursday announced intensified pollution-control measures across Delhi-NCR, deploying sprinklers, anti-smog guns and road-sweeping machines. But a comparison with its previous winter programme raises a question: what has changed beyond another call for stricter implementation? Is it again a _rasm aadaygi_ by a govt that is miserably failing on the front of curbing air pollution from Delhi?

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The authority has deployed around 60 water sprinklers and tankers, 14 anti-smog guns, 23 mechanical road-sweeping machines, two tractor-mounted brooms and more than 900 workers. Its statement additionally lists 13 sweeping machines operating across 157 km of national highways.

The announcement follows the invocation of Stage I of the Graded Response Action Plan (GRAP) across NCR as Delhi’s air quality slipped into the ‘poor’ category.

A familiar prescription

The core measures are not new.

On October 29, 2025, NHAI announced a standard operating procedure prescribing mechanical sweeping, anti-smog guns, continuous water sprinkling at construction sites and covering construction materials. It also required road maintenance, air-quality monitoring, inspections and audits, while assigning responsibilities to contractors and field officials.

This year’s announcement again stresses equipment deployment, daily sweeping, covered construction materials and compliance with Commission for Air Quality Management norms. Officials must submit daily reports supported by geo-tagged photographs.

The emphasis is therefore on executing an existing approach more intensively. The announcement does not establish how deployment compares with last winter, which earlier shortcomings have been corrected or what measurable improvement is expected.

Deployment is not an outcome

The number of machines and workers indicates resources committed. It does not, by itself, establish how much pollution has been prevented.

Geo-tagged photographs can document activity at a location. They cannot alone show whether a road remains dust-free between cleaning rounds, whether equipment operates for the required hours or whether construction sites comply throughout the day.

A credible assessment would require disclosure of road coverage, equipment uptime, dust collected and safely disposed of, repeat violations, corrective action and changes in pollution levels near project sites.

Without those indicators, the public is being shown what NHAI has deployed, rather than what its deployment has achieved.

Why should this winter be different?

The persistence of poor winter air does not prove that every dust-control measure is ineffective. Nor can Delhi’s overall air quality be used on its own to isolate NHAI’s contribution.

However, an analysis by the Centre for Research on Energy and Clean Air, cited in reports on Thursday, found no consistent improvement in Delhi’s winter air quality across the four winters since the 2022 GRAP revision. That raises a broader question about the effectiveness of repeated seasonal interventions.

Existing measures could produce better results if their coverage, frequency, maintenance and enforcement improve. But that requires evidence of what previously went wrong and how it has been fixed.

Were machines unavailable or underused? Were stretches repeatedly left uncovered? Did contractors ignore dust-control requirements? Were violations followed by penalties and verified corrective action?

The latest announcement provides no such assessment.

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Decongestion claims need measurement

NHAI also cited UER-II, Dwarka Expressway, DND–Sohna Expressway and Delhi–Dehradun Expressway as helping reduce congestion and vehicular emissions. It did not publish quantified emissions reductions in the statement.

These claims should be tested through traffic volumes, journey times, idling and emissions estimates, rather than inferred from road development alone.

For NHAI, the immediate accountability test is straightforward: demonstrate whether dust from its roads and construction sites is falling, identify persistent problem locations and disclose action against non-compliance.

Another winter deployment announcement cannot answer why familiar measures should deliver a different result. A published assessment of performance can.

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