Noise Testing — Ambient & Occupational
A noise breach at the boundary can hold up an SPCB consent-to-operate, and unmanaged workplace noise is a Factories Act non-compliance and a hearing-damage risk. Auriga Research provides NABL-accredited ambient and occupational noise testing for industries, construction sites, and infrastructure projects across India, measured against the Noise Pollution (Regulation and Control) Rules, 2000 and the Factories Act 1948.
Noise monitoring is conducted on-site at client premises by our Bahadurgarh team — NABL TC-7710 accreditation includes Site Testing for noise levels. This is a direct, named accreditation for on-site noise measurement. We measure Leq, Lmax, Lmin, and the L10 / L50 / L90 percentiles using Type 1 sound level meters calibrated to IEC 61672, across the prescribed day (6 am–10 pm) and night (10 pm–6 am) periods per IS 10399 and CPCB protocol.
Backed by the Arbro Group's analytical heritage — Arbro Lab since 1990, Auriga Research since 2007 — with NABL ISO/IEC 17025 accreditation, our reports give the day / night Leq with the area-category comparison — accepted by State Pollution Control Boards for consent, by factory inspectorates for occupational-noise compliance, and by MoEFCC / SEIAA and EIA consultants for the noise baseline.
Noise Monitoring Parameters
Each parameter is mapped to its descriptor or standard so EHS and EIA teams can match scope to the Noise Rules 2000 / Factories Act requirement at a glance.
Equivalent Continuous Level
Leq for day and night periods — the primary descriptor assessed against the Noise Pollution Rules 2000 zone limits.
Peak & Minimum
Maximum and minimum sound pressure levels recorded during the measurement window.
Statistical Percentiles
Percentile descriptors — L10 (intrusive), L50 (median), L90 (background) noise levels.
Frequency Analysis
Octave and 1/3-octave band spectra for noise-source characterisation.
Instrumentation
Type 1 integrating sound level meter calibrated to IEC 61672.
Measurement Method
Ambient noise measurement per IS 10399 and CPCB protocol.
Diurnal Monitoring
Separate day (6 am–10 pm) and night (10 pm–6 am) monitoring as prescribed by the 2000 Rules.
Occupational Noise
8-hour time-weighted average workplace noise exposure per the Factories Act 1948.
Boundary Compliance
Industrial / project boundary noise compliance monitoring for SPCB consent.
EIA Noise Baseline
Baseline and post-project ambient noise mapping for EIA studies.
Permissible Noise Limits — Noise Pollution Rules 2000
| Area / Zone | Day dB(A) Leq (6 am–10 pm) | Night dB(A) Leq (10 pm–6 am) |
|---|---|---|
| Industrial area | 75 | 70 |
| Commercial area | 65 | 55 |
| Residential area | 55 | 45 |
| Silence zone | 50 | 40 |
Silence zones extend 100 m around hospitals, educational institutions, and courts. Occupational (workplace) noise is separately limited to 90 dB(A) as an 8-hour time-weighted average under the Factories Act 1948.
How It Works
Get a Quote & Site Plan
Share your site, the area category (industrial / commercial / residential / silence zone), and the driver (SPCB consent, Factories Act occupational noise, or EIA baseline). Your dedicated SPOC confirms the measurement locations, the day / night schedule, and the applicable limits before the visit.
On-Site Survey
The Bahadurgarh lab team visits your premises with Type 1 sound level meters (calibrated to IEC 61672) and measures Leq, Lmax, Lmin, and the L10 / L50 / L90 percentiles across the day and night periods at boundary and / or operator positions. The survey runs under the NABL TC-7710 site-testing accreditation and records are registered in YLIMS on return.
Analysis & QA Review
Measured levels are analysed against the Noise Pollution Rules 2000 area-category limits and the Factories Act 90 dB(A) occupational limit as applicable, with frequency analysis where required. Every result passes through a formal internal QA review and sign-off before the report is generated.
Receive Your NABL Report
Your NABL-accredited noise report is delivered digitally within the committed turnaround time. Reports carry Auriga's NABL accreditation under ISO/IEC 17025:2017, include the day / night Leq and area-category comparison, and are accepted by SPCBs, factory inspectorates, and EIA authorities. Track status in real time through YLIMS.
Turnaround Time
| Service | Standard TAT | Express |
|---|---|---|
| Single-location ambient noise survey (day + night) | 1–2 days on-site | Scheduling priority |
| Occupational noise survey (Factories Act) | 1–2 days on-site | Available |
| Report with day / night Leq & zone comparison | 5–7 business days | Available |
| Frequency (octave-band) analysis | + 2–3 business days | On request |
| Multi-location EIA noise baseline (per season) | 10–15 business days | On request |
Who Needs Noise Testing
- Industries seeking or renewing SPCB consent-to-operate with boundary noise compliance.
- Factories under the Factories Act 1948 needing occupational noise (90 dB(A) 8-hour TWA) compliance surveys.
- Construction projects operating in proximity to residential areas and silence zones.
- Infrastructure projects (highways, ports, airports, metro) requiring an EIA noise baseline.
- Industrial estates and SEZs running periodic boundary-noise compliance monitoring.
- DG-set, HVAC, and plant-room operators verifying equipment noise against zone limits.
- EIA consultants assembling baseline and post-project noise datasets for clearance.
- EHS teams defining where engineering controls or hearing PPE are required from a noise map.
- Hospitals, schools, and courts (silence zones) documenting compliance with the 50 / 40 dB(A) limits.
- Event venues, malls, and commercial complexes managing community-noise complaints.
Why Auriga for Noise Testing
NABL TC-7710 site-testing accreditation for noise
Our Bahadurgarh lab's NABL scope explicitly names Site Testing for noise levels — a direct, verifiable accreditation for on-site noise measurement, not a bench method stretched to the field.
Ambient and occupational noise covered
Boundary / receptor noise under the Noise Pollution Rules 2000 and workplace noise (90 dB(A) 8-hour TWA) under the Factories Act 1948 — the two distinct drivers handled by one team in one visit.
Type 1 meters, IEC 61672 calibrated
Type 1 integrating sound level meters calibrated to IEC 61672, reporting Leq, Lmax, Lmin, and L10 / L50 / L90 percentiles per IS 10399 and CPCB protocol.
Day / night zone comparison built in
Reports give the day and night Leq directly against the correct area-category limit, so SPCB and EIA reviewers can read compliance at a glance.
Pairs with illumination and IAQ site testing
Noise, illumination, and indoor air quality can be surveyed in one coordinated site visit — one mobilisation, one consolidated workplace-environment report.
Arbro Group analytical heritage
Established analytical heritage through the Arbro Group (Arbro Lab since 1990, Auriga Research since 2007), with NABL ISO/IEC 17025 accreditation — the audit trail EHS managers, factory inspectors, and EIA consultants look for in a site-testing partner.