DG Set Noise in a Housing Society or Market

A DG set must meet noise and emission standards under the Environment (Protection) Rules 1986: it needs an acoustic enclosure or an acoustically treated room, an exhaust stack of the required height, and proper maintenance, and the noise reaching nearby homes must stay within the Noise Rules limits. If a society generator outside your flat or a row of shop generators in a market is too loud, raise it first with the AOA or traders' association, then complain in writing to the State Pollution Control Board, with copies to the municipal body and, at night, the police.

This guide covers two common situations: a generator in a housing society placed close to flats, and generators run by shops and businesses in a market or along a street. It explains the rules a DG set has to meet, who is responsible for each kind of set, and how to get a noisy or smoky generator fixed without a long fight. Our main page on noise pollution complaints covers other sources.

For the emission side and the Delhi NCR restrictions in detail, see our guide on DG set rules in Delhi NCR. Businesses that need a set made compliant can read our page on DG set and emission norms.

The essentials

The society's DG set outside my flat runs for hours. What can I do?

Start inside the society, in writing. Write to the AOA or RWA (or the builder's maintenance agency if the society has not been handed over), describe where the set is, when it runs and how loud it is in your flat, and ask for three specific things: a check of the acoustic enclosure, a check of the exhaust stack, and a noise reading at your window with the set running. Many generator problems come down to a damaged enclosure door, a worn silencer, missing anti-vibration mounts or a stack that ends below the flats. These are cheap to fix compared with a dispute.

If the society does not act within a few weeks, complain in writing to the regional office of the State Pollution Control Board. The board can inspect, measure noise and check the set against the standards, and can direct the society to fix it. Copy the municipal body if the set has been put on common land, a setback or a fire passage. If the set runs late at night and the noise is severe, the police can also be called.

Do not ask for the generator to be removed altogether unless there is a real alternative. A society needs backup power for lifts, water pumps and fire systems. The realistic goal is a compliant set, in the right place, running only when needed.

Rules a DG set has to follow

Diesel generator sets are covered by noise and emission standards in the schedules to the Environment (Protection) Rules 1986. In plain terms, a set must be fitted with an acoustic enclosure or installed in an acoustically treated room, so that the noise outside is cut down substantially. The enclosure or room must be maintained, with doors kept shut and seals in place. New sets must be of a model certified as meeting the noise and emission standards.

The exhaust must be discharged through a stack whose height is worked out from the capacity of the set and the height of the building it serves, so that fumes clear the roof and do not drift into homes. A short pipe pointing at the next tower, or exhaust coming out at first-floor level next to bedrooms, is a common breach. Proper siting also matters: the set should be on a firm base with anti-vibration mounts, away from windows and boundary walls where possible.

On top of these source standards, the Noise Pollution (Regulation and Control) Rules 2000 fix the ambient limits that must be met where people live: 55 dB(A) by day and 45 dB(A) by night in a residential area, and 65 and 55 in a commercial area. A set can carry a certified enclosure and still break the ambient limit if it is placed next to a bedroom wall. Large building projects also usually have DG set conditions in their environmental clearance and consent, which can be obtained by RTI.

What to look for when you inspect a noisy DG set

In a society, who is responsible for the DG set?

Before handover, the builder or its maintenance agency is responsible. The builder chose the location and the set, and the project's environmental clearance, consent and building approvals often include conditions on the DG set. If a set has been put in a place the approved plans do not show, or without the required enclosure and stack, that is a builder issue, and our guide on housing society disputes with builders over STPs and EC explains how such disputes are handled. A complaint about the set's design may also be worth raising with the builder under the sale agreement or with the real estate regulator, depending on the stage of the project.

After handover, the AOA or society becomes responsible for operating and maintaining the set, even if the builder chose a bad location. The board will usually send its notice to whoever is running the set at the time. That is why it is better for residents and the managing committee to treat the problem as a shared one: the committee needs the complaint on record to justify spending money, and residents need the committee to act.

In some societies, individual flat owners or shop owners in the commercial block have installed their own small sets. Each such set has to meet the same standards. The society's bye-laws may also restrict private generators in common areas, which gives the committee a separate basis to act.

Getting the AOA to fix it

Bring it to the managing committee with facts: the location, running hours from the society's own logbook, a few phone readings at your window, and photos of the enclosure and stack. Ask the committee to get a technical check from the DG set supplier or an acoustic consultant, with written options and costs. Typical options are repairing or replacing the enclosure, adding a residential-grade silencer, raising the stack, fitting anti-vibration mounts, building an acoustic barrier wall, or relocating the set.

Relocation is the most expensive and the most contested, because some other residents will then be closer to it. A general body resolution helps settle it. Where the set runs mainly to cover short outages, some societies have reduced running time by putting lifts, pumps and common lighting on a battery backup system, which is a commercial decision for the society but worth raising.

If the committee refuses to act, or keeps postponing, your written requests and its replies become evidence that the society knew and did nothing. That is the point at which the board complaint is filed.

How to complain about DG set noise

DG sets in markets and in front of shops

In many markets, each shop runs its own small generator during power cuts, placed on the footpath or the shop step with the exhaust pointing at the road or the flats above. One set may be tolerable; twenty sets running together, with diesel fumes collecting under the shop canopies, are not. Rented generators brought in for weddings, exhibitions and night markets add to it.

Several laws apply at once. Each set must meet the DG set standards, and the combined noise at the homes above must stay within the commercial or residential limit, depending on how the area is classified. Sets on the footpath are also an encroachment, which the municipal body can remove. If the market has a traders' association, start there, because a collective solution such as a properly sited shared generator often costs traders less than individual sets.

Residents living above shops should write to the State Board and the municipal body together, naming the shops and attaching photos. The board can inspect the market as a whole. In Delhi, the regional offices of the DPCC handle such complaints; in western Uttar Pradesh, including Noida and Ghaziabad, the UPPCB does.

Delhi NCR: GRAP and CAQM limits on DG sets

In Delhi NCR, generators face extra restrictions because of air quality. Under the Graded Response Action Plan, the use of DG sets is restricted at higher stages, with exceptions for essential and emergency services; our guide on GRAP stages explains how the stages work. The Commission for Air Quality Management has also issued directions on the fuel and emission control equipment that DG sets in the region must use, depending on their capacity.

These rules change from time to time, so check the current position before relying on any particular restriction. For residents, they add a useful point: a society or shop running a non-compliant DG set during a GRAP stage that restricts it is breaching an air quality direction as well as the noise rules, and that tends to get a faster response.

What to collect for a DG set complaint

When a DG set dispute is worth taking to the NGT

Most generator complaints are settled by the board's inspection and a direction to fix the enclosure or the stack. The NGT becomes worth considering when the board has inspected and then done nothing, when the society or business ignores the board's directions, or when the problem is wider than one set, such as a market where dozens of generators run every evening or a commercial complex whose sets face a residential colony.

Before filing, check that you have the written requests to the society or owner, the board complaint, any inspection report and the RTI replies. The tribunal will ask what the authorities were told and what they did. It usually calls for a report from the board or a joint committee, and may direct relocation, enclosure, restricted running hours or penalties. A case filed over one week of noisy running, with no earlier complaint, is likely to be sent back to the board with a direction to decide it, so build the record first.

For societies and businesses that receive a board notice

A notice from the State Board about a DG set usually asks for an explanation and for compliance within a fixed time. Reply in writing before the deadline, with the enclosure details, a stack drawing, the supplier's certification, a fresh noise monitoring report from an accredited laboratory and a short plan with dates for any work still to be done. Boards are generally willing to give time to an AOA or business that shows a credible plan.

If the board has already issued directions, such as sealing the set or imposing environmental compensation, the timeline tightens. An appeal against a direction under section 31A of the Air Act or section 5 of the EP Act goes to the NGT within 30 days of communication, but in most DG set matters it is faster to complete the work and ask the board to revoke the direction.

When Advocate B.K. Singh advises an AOA on a DG set notice, he asks the committee for the society's own running logbook first, because a log that matches grid outages shows the set is backup, not a habit, and because missing logs are the first thing an inspecting officer asks for.

What we do in DG set noise matters

• For residents: we draft the request to the AOA or owner, the RTIs for consent and EC conditions, and a board complaint that asks for measurement at your home.
• For RWAs near markets or commercial complexes: we frame a joint complaint to the board and the municipal body and, where they fail, an NGT application.
• For AOAs and businesses: we reply to board notices, plan the technical fixes with your supplier, and seek revocation of sealing or penalties once the set is compliant.
• Against builders: where a bad location or missing enclosure is a design fault, we advise on recovering the cost.

Mistakes and limits in DG set complaints

A generator that runs during a genuine power cut to keep lifts and pumps going is not unlawful, and a complaint that aims to stop backup power altogether will not get far. Focus on the enclosure, the stack, the location and unnecessary running. Residents also sometimes rely on a single phone reading taken next to the set rather than at their window; the limit applies at the receiver, so measure where you live.

On the society side, the common mistake is treating the complaint as a personal attack and refusing to look at the set. That converts a small repair into a board case. Another is moving the set closer to someone else's flat without a resolution, which simply creates the next complaint.

Related guides

If a banquet hall's generator is the source, see banquet hall and DJ noise. For a factory's machines rather than a generator, read factory machinery noise, and for hospitals and schools, silence zone rules. For the NCR compliance side, our page on GRAP and CAQM compliance may help, and for a tribunal case, how to file a case in the NGT.