Hot Mix and Asphalt Plant Pollution: Where to Complain

If a hot mix or asphalt plant is throwing dust, black smoke or bitumen fumes over your home, the first complaint goes to the regional office of your State Pollution Control Board (DPCC in Delhi), because the plant needs the board's consent under the Air Act to run at all. Send a copy to the District Magistrate or SDM and to the road agency whose contract the plant is serving. If the board does nothing and the harm is serious, the National Green Tribunal can step in.

This guide covers the plants that make the black mix for roads: drum mix and batch mix plants that heat stone aggregate and bitumen, usually set up by road contractors near a highway, village or new colony. It explains why they pollute, what permissions they need, which office does what, and how to build a complaint an inspector cannot brush aside. For smoke from other units, see our note on complaining about factory smoke near your home.

If you need someone to take the matter up for you, our industrial air pollution lawyers handle complaints, board proceedings and NGT applications for residents, panchayats and RWAs, and also advise plant operators who want to stay on the right side of the rules.

The essentials

Where do I complain about a hot mix plant near my house?

Start with the State Pollution Control Board, at the regional office that covers your district. In Delhi that is the Delhi Pollution Control Committee; in Uttar Pradesh it is the UPPCB regional office; in Haryana, the HSPCB. The board is the authority that grants the plant its consent to establish and consent to operate under section 21 of the Air (Prevention and Control of Pollution) Act, 1981, and it is the only authority that can inspect the stack, take samples and withdraw that consent.

Send copies, on the same day, to the District Magistrate or the SDM of your sub-division, and to the agency whose road the plant is serving. The SDM has power under section 152 of the Bharatiya Nagarik Suraksha Sanhita, 2023 to order removal of a public nuisance. The road agency, usually the state PWD, a development authority or a national highways body, can press the contractor through the terms of its contract, which is often the fastest lever of all.

The police come in only for specific things: trucks blocking a village road, night noise from generators, or threats when residents object. The National Green Tribunal comes later, when the board has been told and has not acted. If you go straight to the NGT, the tribunal's first step is usually to ask the board for a report anyway.

What a hot mix plant actually does, and where the pollution comes from

A hot mix plant dries and heats crushed stone in a rotating drum, using a burner fired by diesel, light diesel oil or sometimes furnace oil, and then coats the hot stone with heated bitumen. The result is the black mix that is laid on roads. Drum mix plants do this in one continuous drum; batch mix plants dry the stone first and mix it in batches. Both produce the same broad kinds of pollution.

The largest source is fine dust from drying the aggregate. A properly run plant passes the drum exhaust through a dust collector, usually a bag filter or a wet scrubber, before it leaves the stack. When the bags are torn, the scrubber is dry or the collector is bypassed to save time, the dust goes straight out. Residents describe a grey film on roofs, crops and water tanks within days.

Then there are the fumes. Heated bitumen gives off a blue haze with a strong tarry smell, especially at the loading point where trucks are filled. Add the burner smoke, diesel generators, open stockpiles of stone dust, and dozens of tippers on an unpaved approach road, and you have a site that can make life miserable for anyone within a few hundred metres.

Which authority can do what about a hot mix plant

Each office has different powers. A complaint that reaches the right desk with the right request moves faster than a general letter to everyone.

Does a hot mix plant need pollution board consent?

Yes. A hot mix plant emits air pollutants, so it needs consent to establish before it is set up and consent to operate before it starts production, under section 21 of the Air Act. If it uses water for a scrubber or discharges wastewater, Water Act consent applies too. Boards place these plants in the orange or red category according to their own lists; the category changes the paperwork and inspection frequency, not the need for consent. Our guide on CTE and CTO explains the two stages.

The consent order is the most useful document in any complaint. It lists the plant's capacity, permitted fuel, required pollution control equipment (typically a bag filter or scrubber, a minimum stack height, covered conveyors, sprinkling, wind-breaking walls and a green belt) and location conditions. With it, you are no longer saying the plant is bad; you are saying it breaks specific conditions of its own consent.

Location rules come from the state. Most State Boards or state governments have issued siting guidelines for hot mix plants and stone crushers, setting minimum distances from habitation, schools, hospitals, highways and rivers. They differ between states and are revised from time to time, so get the current guideline from your board, through RTI if needed.

Road projects bring one more layer. Some highway projects need environmental clearance under the EIA Notification 2006, and their clearance conditions or environmental management plans commonly deal with where contractors may put hot mix plants and crushers. If the road project has a clearance, its conditions are worth reading; our guide on highway projects and environmental clearance explains how to find and use them.

The provisions that matter in a hot mix plant complaint

How to complain about a hot mix plant so that it gets action

This works for one household or a whole village. Do the first three steps within a few days; plants move quickly.

Keep everything in one folder, in date order. That folder decides whether a case can go to the tribunal within a week or needs a month of catching up.

What evidence works against a hot mix plant

The plant is temporary. Is it still worth complaining?

Yes, and the temporary nature is often the strongest point in your favour. Contractors set up plants quickly and sometimes skip the consent process, assuming nobody will check before the project ends. If an RTI reveals there is no consent at all, the board's options are simple: direct closure and disconnection of power under section 31A. Boards act on no-consent cases far more readily than on arguments about how much dust is too much.

The other reason is that a plant that moves on often leaves damage behind: a field covered in bitumen waste, a pond silted with stone dust, a village road broken by heavy trucks. A claim for compensation and restoration can be made to the NGT under section 15 within five years, so the record you build now still counts after the plant has gone.

What does not work is waiting for the plant to leave on its own. Projects get extended and the same plant runs for three years instead of six months. The residents who get relief are usually the ones who wrote in the first month.

What the pollution board actually does when it inspects

An inspector will usually check whether the plant has valid consent, whether the capacity and fuel match the consent, whether the dust collector is installed and working, whether the stack meets the required height, and whether the site has the sprinkling, covering and boundary measures the consent requires. Some boards take a stack sample, which is analysed against the emission standard in the consent; others record visual observations and photographs.

Timing matters. Many plants run cleanly on the day an inspector is expected and badly the rest of the week. Your diary and night-time videos let you ask for a surprise inspection at the worst hours; a letter saying the plant runs heavily between 10 pm and 3 am, with three dated videos, is hard for an officer to ignore.

If violations are found, the board usually issues a show-cause notice, then a direction under section 31A that can include closure and disconnection of electricity. It may also levy environmental compensation under the CPCB method, explained in our guide on what environmental compensation means. Plants are often allowed to restart once they show compliance, sometimes against a bank guarantee.

Is the hot mix plant near you breaking the rules?

When is it worth going to the NGT about a hot mix plant?

The NGT is worth it when the board has had a fair chance and has not acted, when the plant is plainly in a prohibited location, when there is real harm to health, crops or water, or when you want compensation and restoration. It is less useful for a short, minor dust problem that the board is already handling. The tribunal hears these matters under section 14 (a substantial environmental question) and section 15 (relief and compensation).

In practice, the NGT often forms a joint committee, for example of the State Board and the District Magistrate, to inspect and report, and you can object if the report misses things. Many applications end with directions to the authorities with a timeline. Our page on filing a case in the NGT explains the process and court fee.

Advocate B.K. Singh's usual advice to villages facing a road contractor's plant is to file the NGT application only after the board complaint and RTI are on record, because the tribunal then sees a plant that was given every chance and an authority that did not use its powers. That framing tends to produce directions with deadlines, rather than a request for yet another report.

Mistakes residents make with hot mix plant complaints

The most common mistake is a complaint with no name, no location and no dates; the board cannot act on a letter about a plant somewhere near the bypass. The second is writing only to the contractor or the police, neither of whom can withdraw consent. The third is relying on a siting distance heard from someone in another state. Get the current guideline in writing.

People also stop after the first inspection, and boards close complaints when the plant looks compliant on the day. If the problem continues, say so in writing within a week, with fresh evidence. For plant owners on the other side, our guide on replying to a closure notice explains what a good reply contains.

Related guides on air pollution from industry

Hot mix plants often come with a stone crusher nearby; for those, see our page on stone crusher and quarry pollution. If the main problem is smell rather than dust, our note on industrial odour complaints will help, and if you want to know what the air quality numbers in a monitoring report mean, read PM10 and PM2.5 standards explained. Brick kilns follow a separate set of rules, covered in our guide on brick kiln pollution.