The idea is to apply such coatings to frequently used public spaces – roads, pavements, busy pedestrian pathways, markets and other high-footfall zones – so that everyday air pollution can be reduced continuously and passively.

In a fresh effort to combat the worsening air quality in the national capital, Delhi Environment Minister Manjinder Singh Sirsa has ordered a time-bound scientific study of photocatalytic “smog-eating” coatings, including titanium dioxide-based surfaces, hoping they may offer a drawbridge between policy and technological innovation to reduce harmful pollutants like nitrogen dioxide (NO₂) and volatile hydrocarbons.

The announcement came on September 21-22, 2025, when Sirsa directed the Environment Department of the Delhi government to initiate field trials of these self-cleaning surfaces and other related innovations.

“Smog-Eating” Coatings?

Photocatalytic coatings are special surfaces treated with materials such as titanium dioxide (TiO₂), which under sunlight or artificial light catalyse chemical reactions that break down certain air pollutants. Substances like NO₂ and volatile organic compounds (VOCs) can be oxidised and converted to less harmful or inert components.

The idea is to apply such coatings to frequently used public spaces – roads, pavements, busy pedestrian pathways, markets and other high-footfall zones – so that everyday air pollution can be reduced continuously and passively.

What the Government Plans

Sirsa has laid out a structured roadmap with tight timelines:

• Within 30 days, the Environment Department is to sign a Memorandum of Understanding (MoU) with a reputed scientific or research institution to kick off field trials.
• These trials will measure not only the pollutant-reduction efficacy, but also cost, safety, sustainability, and the ease of procurement of credible suppliers.
• Monthly progress updates will be made public. A final study report is expected within six months of the MoU signing.

If the study confirms that these coatings are effective and economically viable, the government intends to push for citywide deployment, prioritising busy corridors, congested markets, and high-public-use open spaces. A proposal for this large-scale rollout would go before the Delhi Cabinet.

Broader Context and Innovation Push

The initiative is part of a larger, continuous environmental action plan being pursued by the Delhi government to tackle pollution through evidence-based and tech-driven approaches.

Delhi is also leveraging its Innovators’ Challenge, an open initiative inviting startups, experts, students and citizens to propose practical anti-pollution solutions. Sirsa said many ideas have already been shortlisted for pilot testing. The idea is to fund what works, test rigorously, and scale up successful models swiftly.

Potential Impacts & Challenges

If successful, smog-eating surfaces could offer a visible and tangible improvement in air quality, particularly in hotspots. NO₂ and VOCs are major contributors to smog, respiratory illnesses, and environmental stress. Reduction of these could ease health burdens, especially for vulnerable populations.

However, there are challenges:

• Efficacy under real-world conditions (dust, pollution load, weather) may differ from laboratory claims.
• Durability of coatings under wear and tear (traffic, footfall, cleaning) needs assessment.
• Initial costs vs maintenance, and ensuring that deployment is cost-effective over time.
• Safety of any by-products, and environmental impact of manufacturing and applying coatings.

Sirsa emphasised that safety, value for money, and sustainability will be central criteria in evaluating whether to scale up.

What Experts and Citizens Are Watching

Citizens, environmentalists and health experts will be watching closely. For many Delhiites, air quality is a year-round concern, becoming particularly dire in winter months when pollutants accumulate. Technology interventions that provide continuous passive pollution reduction – without needing heavy energy inputs or drastic regulatory overhauls – could be game-changers if they prove their mettle.

Some may view this as one among many steps: stricter vehicular emissions norms, construction site regulations, biomass and crop burning controls, waste management – all remain critical. Smog-eating coatings are unlikely to be silver bullets, but could be valuable complements.

Over the next few months, as the MoU is signed and trials begin, Delhi government will provide monthly progress reports. By early 2026 (six months later), a fuller picture is expected: whether these coatings reduce NO₂, VOCs measurably in busy areas; whether cost and logistics allow deployment; and which types/brands of coatings offer best performance.

If these phases are passed, one may soon see smog-eating pavements, roads and walls in Delhi – shining surfaces that silently clean the air above them, a novel front in the city’s fight against pollution.