Cement Plant Dust and Stack Emissions: Rules and Complaints

A cement plant is regulated at three levels: it needs prior environmental clearance under the EIA Notification 2006, consent to establish and operate from the State Pollution Control Board under the Air and Water Acts, and it must meet the emission standards for cement plants in the Environment (Protection) Rules. Most complaints are about fugitive dust from crushing, storage, packing and trucks rather than the main stack. Complain to the State Board's regional office, and where clearance conditions are being broken, to the Environment Ministry's regional office as well.

This guide is for villagers and residents living near a cement plant or a cement grinding unit, and for plant managers who want to understand where the legal risk sits. It explains how a cement works produces dust and gases, which permissions and standards apply, what the board and the Environment Ministry check, and how to build a complaint or a compensation claim that is taken seriously.

If you need help with a specific plant, our industrial air pollution lawyers act for affected villages and RWAs in complaints and NGT applications, and advise cement and grinding units on consents, clearance conditions and notices.

The essentials

Where do I complain about dust from a cement plant?

Write to the regional office of the State Pollution Control Board that covers the plant. The board granted the plant its consent to operate under section 21 of the Air Act and section 25 of the Water Act, and it can inspect, monitor, issue directions and, under section 31A of the Air Act, order closure or disconnection of power. Ask specifically for an inspection of fugitive dust controls and for the plant's stack monitoring and online monitoring data.

If the plant has an environmental clearance, which every cement plant set up or expanded since the EIA Notification of 2006 should have, send a copy of your complaint to the Environment Ministry's regional office that monitors clearance conditions. Clearance letters for cement plants usually contain detailed conditions on dust control, green belts, truck movement and monitoring. A breach of those conditions is a separate violation, and the ministry's office can inspect and report on it. Our guide on EC conditions not being followed explains how that complaint works.

Copy the District Magistrate if dust is affecting a whole village or a school, because the DM can call a joint inspection and has public nuisance powers under section 152 of the BNSS. If crops, houses or water sources are being damaged and the authorities are not acting, the National Green Tribunal can order inspection, directions and compensation.

How a cement plant produces dust and gases

A full cement plant is a long chain of dusty operations. Limestone is blasted and dug from a mine, crushed, stacked and blended, then ground with clay, iron ore and other additives in a raw mill. That raw meal is fed into a preheater tower and a rotary kiln, where it is burnt at very high temperature with coal or pet coke to make clinker. The clinker is cooled, stored, ground with gypsum and often fly ash or slag in a cement mill, and finally packed into bags or loaded in bulk.

Every transfer point in that chain can leak dust: crushers, conveyor junctions, open stockpiles of limestone, coal and clinker, mills, silos, the packing plant and the loading bays. Then there are the trucks and dumpers carrying limestone in and cement out, often on village roads not built for them. In most complaints we see, this fugitive dust is the real problem, not the main kiln stack.

The kiln and the coal mill produce the stack emissions: particulate matter, and gases such as sulphur dioxide and nitrogen oxides from burning fuel at high temperature. A standalone grinding unit, which only grinds clinker brought from elsewhere, has no kiln but still has mills, silos, packing and heavy truck traffic, so its dust problem can be just as serious for the colony next door.

Which parts of a cement plant cause pollution, and what controls are expected

The exact requirements are in each plant's consent and clearance letters. This table gives the usual picture so you know what to look for.

Which rules apply to a cement plant?

What the stack emission rules mean in practice

The emission standards for cement plants set the maximum concentration of particulate matter, sulphur dioxide and nitrogen oxides that may leave a stack, measured in milligrams per normal cubic metre. They differ for older and newer kilns and for plants that co-process waste. We do not quote the figures here because they are applied through each plant's consent, which may be stricter, and because the consent is the document you will actually rely on.

Large cement plants have been directed by the CPCB and State Boards to install online continuous emission monitoring on their main stacks, with data transmitted to the regulators. This matters to residents in two ways. First, if the online data shows repeated exceedances, the board already has the evidence and has less excuse for inaction. Second, gaps in the data, where the monitor was down for days, are themselves worth questioning. You can ask for the data and the board's record of exceedance alerts through RTI.

Stack exceedances are usually visible as darker or denser plumes, especially at start-up, during power trips or when a bag filter or electrostatic precipitator fails. Dated videos of such episodes, with the time noted, can be matched against the online data and the plant's own logbook.

How to complain about cement dust so the complaint sticks

Cement companies are usually well organised and will answer a complaint with a file of compliance reports. Your complaint needs to be specific enough to survive that.

The six-monthly compliance report is worth reading line by line. Plants sometimes describe controls that do not exist on the ground, and a photo that contradicts a sentence in the plant's own report is powerful evidence. Our page on EC compliance reports explains what these reports contain.

Cement dust on crops: can farmers get compensation?

Yes, if they can show the damage and link it to the plant. Cement dust settling on leaves blocks light and can form a crust, and farmers near cement plants often report lower yields of vegetables, pulses and fodder. The NGT can award compensation and restoration under section 15 of the NGT Act, applying the polluter pays principle, within five years of when the cause of action first arose, plus up to 60 days for sufficient cause.

The weak point in most crop claims is proof. A claim that says the whole village lost half its crop, with nothing to back it up, will not go far. What works is a record made season by season: the patwari's or agriculture officer's inspection notes, photographs of dust-coated crops alongside the same crop further from the plant, yield records or mandi receipts compared with earlier years, and where possible a report on dust deposition or leaf samples from a recognised laboratory.

Farmers sometimes accept small private settlements from the plant without any written record of what was paid and for what. That is their choice, but it can make a later claim harder. If an offer is made, get advice first. Our page on compensation for pollution damage explains how these claims are built.

Fly ash and waste fuels at cement plants

Many cement plants use fly ash from thermal power stations to make blended cement, which is good use of a waste product but brings its own dust risk. Fly ash is extremely fine. Open dumping in the plant yard or spillage from uncovered trucks can spread it widely, and the fly ash utilisation notification of December 2021 places obligations on power plants that supply it. Our guide on fly ash dumping rules covers those obligations.

Some kilns also co-process waste such as plastic, tyres, industrial sludge or refuse-derived fuel. This is permitted, but only with authorisation and under conditions on what waste may be burnt, how it is stored and how emissions are monitored. If you see waste arriving and being stored in the open, or smell burning plastic from a plant that is not authorised to co-process, ask the board for the authorisation and the manifests for the waste received.

Is the cement plant near you following the rules?

Cement plant expansions and public hearings

Cement companies expand often, adding a kiln line, a grinding unit or a captive power plant. An expansion needs prior amendment of the environmental clearance and fresh consent, and for many projects a public hearing. The public hearing is the moment when villagers' objections go on the record before the expert committee, so it is worth preparing for properly. Our guide on objections at an EIA public hearing explains how to make them count.

If a plant has already expanded without amending its clearance, that is a serious violation, and the Supreme Court's recent decisions on post-facto clearance have changed the position more than once, so current advice is needed. See our guide on expansion without EC amendment.

Taking a cement plant to the NGT

The NGT hears cement plant matters regularly, and its usual first step is to constitute a joint committee, often of the CPCB, the State Board and the District Magistrate, to inspect and report. The report will be compared with your evidence, and you can file objections if it is thin or one-sided. If the committee confirms violations, the tribunal typically directs compliance within a time frame, and may impose environmental compensation on the polluter pays principle.

In cement dust cases that Advocate B.K. Singh has handled, the evidence that made the difference was rarely the stack data. It was the gap between the plant's own compliance report and the photographs: a report describing covered sheds next to a picture of an open clinker pile. That contradiction tends to move a joint committee faster than any expert opinion.

If you are appealing against an environmental clearance granted to a new cement plant, the route is an appeal to the NGT under section 16 within 30 days of the order being communicated. For an existing plant, an application under sections 14 and 15 is the usual route.

If you manage a cement plant or grinding unit

The complaints that become legal problems usually start with something simple: an open stockpile, a broken bag filter, trucks queuing on a village road. Keep a maintenance log for every dust collector, record sprinkling and road cleaning, and file honest compliance reports. A report that matches the ground protects you; one that does not becomes the other side's best exhibit.

If a show-cause notice or a closure direction arrives, reply within the time given with documents and photographs showing compliance. A closure direction under section 31A can be appealed to the NGT within 30 days. Our page on pollution board notices sets out how we handle these.

Related guides

For the air quality numbers that boards and committees cite, see PM10 and PM2.5 standards explained. Blasting in limestone mines raises its own issues, covered in our guide on quarry blasting damage, and for steel units the companion guide on steel and rolling mill pollution applies.