Noise Level Monitoring & Testing
Reviewed by: Anil Shelke, Environmental Expert | Last updated: June 2025
TL;DR: This guide explains how we measure and test noise levels across industrial & commercial settings using CPCB-approved methods, equipment, and reporting techniques. Includes FAQs, mistakes to avoid, and free calculator access.
Noise or sound level monitoring or measurement is a process to measure the magnitude of Noise in industries and residential area. Data collected from Noise level monitoring & Testing helps us to understand trends and action can be taken to reduce noise pollution.
This process, known as sound level monitoring, plays a crucial role in industrial noise assessment, residential noise measurement, and workplace sound level testing to ensure safe and compliant environments.
Noise pollution is a growing concern in industrial, commercial, and urban environments, requiring precise monitoring to ensure compliance with CPCB/SPCB regulations.
With over 25 years of expertise, Perfect Pollucon Services has been a trusted partner in providing accurate noise level assessments, ensuring regulatory compliance and improved environmental health.
Noise pollution is Low or High-frequency sound that can cause/harm the activity of human life. It can be caused by various industrial Machines, Motor Vehicles and Craft etc. Noise Pollution Monitoring process is a part of Environmental Monitoring & Testing as noise pollution is also increasing exponentially in recent years.
What is Noise Pollution?
Noise pollution is unwanted and unpleasant sound which can deteriorate human health and other living organisms present in the Environment.
It is also referred to as acoustic pollution, and its monitoring is essential in areas such as manufacturing units, construction sites, and urban residential zones for better noise pollution control.
Learn how Perfect Pollucon Services helps clients avoid noise-related legal issues – full guide here.
Types of Noise Pollution
There are multiple way from which noise pollution can occur. Major reasons for noise pollution are deforestation, Construction, Air traffic, Road traffic, Population, etc.
Noise Pollution can be divided into 2 types:
1) Man-made Noise
2) Environmental Noise
Why to Measure Noise at the Workplace?
This is where occupational noise level assessment and industrial decibel testing become important for safeguarding employee health and achieving legal compliance with CPCB noise standards.
Employees and occupants are exposed to this harmful noise. Due to this occupants can face many health problems such as headache, hearing impairment, hypertension, heart problem, annoyance and sleep disorder. to Avoid this situation Perfect Pollucon Services conducts Noise Testing in the company or home to measure high noise within premises. Actions can be taken once the locations and source are identified which are causing the noise. it helps to keep your employee or family safe from Harmful Noise.
👷♂️ To Every EHS Officer Reading This
We know your job is thankless!
You’re the first to be questioned when noise levels spike – and the last to be appreciated when things run smoothly.
This guide was written for you. To make you feel prepared, not pressured.
Because at PPS, we don’t just measure decibels – we respect the people responsible for them.
Why is Noise Monitoring Important?
Noise monitoring is crucial for several reasons. First and foremost, it safeguards human health. Prolonged exposure to high levels of noise can lead to hearing loss and various physiological and psychological disorders, such as stress, sleep disturbances, and reduced productivity.
Additionally, noise monitoring helps ensure compliance with legal regulations and standards set by authorities to protect workers’ well-being. Monitoring also identifies areas of concern, enabling proactive implementation of noise control measures to mitigate risks, improve working conditions, and maintain a harmonious environment for employees.
Furthermore, noise monitoring contributes to good community relations, as industries that proactively manage noise pollution demonstrate their commitment to environmental responsibility and social welfare.
Industries often face noise compliance challenges due to:
- Incorrect placement of noise monitoring devices, leading to inaccurate readings.
- Inconsistent monitoring schedules, missing critical noise variations.
- Failure to implement noise control measures effectively.
Perfect Pollucon Services ensures accurate monitoring, helping industries manage noise pollution and regulatory compliance.
Measurement of Noise Level Using Noise Testing Equipment
Sound/Noise level meter equipment measures noise pollution. It consists of several parts, mainly Microphone, Pre-amplifier, frequency weighting, Processor, Display System, communication System and Power Supply. dB(A) Leq denotes the time-weighted average of the level of sound in decibel on scale A which is relatable to human hearing.
A “decibel” is a unit in noise measurement. “A”, in dB (A) Leq, denotes the frequency weighting in the measurement of noise and corresponds to frequency response characteristics of the human ear.
Leq: It is an energy mean of the noise level over a specified period.
Noise level Survey schedule is planned in such a way that it covers the noise generation by normal daytime activities i.e. from 08:00 am to 10:00 pm and a part of nighttime activities i.e. 10:00 pm to 12:00 am (at night).
Due to the increase in noise pollution in recent years, it is recommended to conduct a measurement of noise pollution program on company premises.
Our Methodology & Process for Noise Monitoring Services
At PPS we follow a 5-step process for noise level monitoring:
- Pre-survey consultation – We visit your site (factory, construction, residential/peripheral zone) in Thane/Mumbai region, and map noise-sources, site boundaries and measurement locations in line with CPCB/MPCB guidelines.
- Equipment calibration & setup – We use calibrated Type 1/Class 1 sound level meters (e.g., Brüel & Kjær 2250, Rion NA-28) and, where longer-term monitoring is required, noise data-loggers or IoT sensor-nodes are deployed. All instruments are accredited and recalibrated annually.
- Measurement execution – Based on zone (industrial / commercial / residential / silent) and time (day/night), we log Leq, Lmax, Lmin, and octave-band data where required. For long-term trends we record data at 5-minute intervals over 24-72 hours or more.
- Analysis & root-cause identification – We review data, map noise-sources (machinery, DG-set, traffic, construction), assess compliance with CPCB/MPCB limits, and identify mitigation opportunities (e.g., sound-enclosures, silencers, layout changes).
- Reporting & certification – We provide you with a detailed report: calibration certificates, measurement logs, compliance assessment vs relevant norms (CPCB/Factory Act/State regulations), photographic evidence, and actionable recommendations. Our reports are accepted by firms, regulatory agencies and auditors alike.”
In Thane/Mumbai/Navi Mumbai regions we often measure in complex mixed-use zones – for example, an industrial facility adjacent to a residential complex: our experience helps you get accurate results the first time, avoiding repeat audits and delays.
Common Mistakes in Noise Level Monitoring
Many industries overlook the need for regular acoustic monitoring services, which can lead to non-compliance. Using a certified noise testing company ensures accurate results and helps maintain acceptable ambient noise levels in sensitive zones.
Top noise monitoring mistakes industries make:
🔸 Not accounting for background noise, leading to misleading data.
🔸 Using outdated or uncalibrated sound level meters.
🔸 Ignoring night-time noise levels, which are subject to stricter limits.
Perfect Pollucon Services helps industries avoid these errors and improve noise management strategies.
Case Snapshot: Pharma Plant, Navi Mumbai
Challenge: Noise levels were 82 dB at the compressor zone, exceeding CPCB limits.
Action: PPS team conducted on-site testing, redesigned the equipment layout, and recommended sound dampers.
Outcome: Noise levels reduced to 67 dB. CPCB compliance report approved within 5 days.
Case Study – Thane Industrial Estate (MSME cluster)
Client: Manufacturing plant, Thane Industrial Estate (Composite Unit)
Challenge: DG-set and pressing machine noise at perimeter boundary measured at 89 dB(A) (night) – exceeding MPCB limit of 75 dB(A) night for industrial zone.
Action by PPS: Conducted 48-hour data-logging at 5-minute intervals, identified dominant noise sources, redesigned acoustic barrier layout, installed silencers on DG-set, and relocated pressing machine away from boundary.
Outcome: Noise at perimeter reduced to 68 dB(A) within 3 days. Client received MPCB clearance without delay and avoided projected penalties of ₹1.2 lakhs.
Testimonial:
PPS’s team in Thane understood our site conditions immediately and delivered results faster than our last provider. Their report was accepted by MPCB with zero queries. – Head EHS, A Manufacturing Company, Thane.
Noise level Monitoring & Testing
The answer to the question of how to measure sound lies in Noise level Monitoring or sound Measurement for a particular instance or for 24X7 hrs to analyze trends for better understanding of the environment. these Processes also used in Noise Impact Assessment (We love to do this 😉 ) by Noise level Testing companies. This process is also called as Noise level Measurement.
To know more about Noise impact assessment.
A) Industrial Noise Measurement
Industrial Noise is the loud sound in industries. In general, it is produced, at every stage in the industry by various aspects like welding, hammering, drilling, blowing, running machinery, motors, sheet metal work, lathe machine work, operation of cranes, grinding, turning, fabricating, forging, compressing, breaking, moulding, steaming, boiling, cooling, heating, venting, painting, pumping, packing, transporting etc. It creates very serious of large-scale noise problems; significantly affect the working people as well as surrounding people.
B) Non-Industrial Noise Measurement
i)Road Traffic Noise:
Road traffic is the most widespread source of the noise. It is directly proportional to the volume of vehicles. Increasing the population is increasing in vehicles and hence increasing of Noise pollution. The major sources of noise in automobiles are exhaust, intake, engine and fan, and tires at high-speed. Noise Level Monitor instrument (or with noise level data logger) measures the noise level.
ii) Residential Noise Measurement
In normal day -to – day activities, various home appliances in our residences produce noise. Some of the major sources are Exhaust Fans, lawn movers, grinders, Fan, Cooling & Heating System, T.V & Music System, motors used for pumping etc.
Read here how to reduce noise pollution
Noise Level Testing Standards
Limits or noise level standards defined by pollution control board during Day time for Residential Noise < 55 dB and Limits during Night time for Residential Noise < 45 dB
In industry, there are of two types Sound Monitoring & testing or Noise Level Measurement:
- Ambient Noise level Monitoring
- In-plant Noise level Monitoring
Our experts follow strict noise monitoring standards in India, aligned with CPCB norms and Factory Act noise compliance guidelines to ensure comprehensive and lawful noise testing services.
Ambient Noise Monitoring
With over 25 years of hands-on experience in environmental compliance, Perfect Pollucon Services understands the critical role ambient noise monitoring plays in maintaining healthy and lawful surroundings.
Unlike general noise level monitoring-which may assess noise within controlled environments or work zones-ambient noise monitoring focuses on the noise levels present in open, external environments like residential areas, commercial zones, or industrial peripheries. It captures how surrounding noise affects human life, wildlife, and urban ecosystems.
This form of monitoring is essential to ensure compliance with CPCB standards, especially in cities where vehicular traffic, industrial operations, and construction activities are on the rise. At PPS, we don’t just measure decibels-we interpret patterns, identify root causes, and help you take proactive steps before noise pollution becomes a compliance issue.
A) Ambient Noise Level Testing Standards
Ambient Noise level Monitoring or Noise pollution Measurement within the industrial zone at ambient conditions. (e.g. Near Main Gate, Near Canteen, Near Manufacturing plant etc.) As per Central Pollution Control Board (as per Factory act 1948):
Limits or acceptable noise level during Day time for Ambient Noise < 75 dB and Limits during Night time for Ambient Noise < 70 dB.
CPCB Noise Limit Checker
Select your zone and time of monitoring to know the applicable noise limit as per CPCB Notification.
B) In-plant Noise level Testing Standards
In-plant Noise level means Sound level measurement allocated in the plant. As per Central Pollution Control Board (as per Factory act 1948) Limits for In-plant Noise level < 90 dB.
Learn more about Workplace or Office Environment Monitoring for employee health and safety
Common Noise Sources & Their Decibel Levels
Understanding how loud different sounds are is crucial for evaluating compliance with CPCB noise regulations. Below is a practical table showing real-world noise sources, their decibel levels (dB), and how they are categorized under compliance norms. Use this as a reference to assess if your facility may be exceeding permissible limits, especially in Industrial or Silent Zones.
| Noise Source | dB Level | Compliance Category |
|---|---|---|
| Breathing | 10 dB | Safe |
| Whisper (library) | 30 dB | Safe |
| Normal conversation | 60 dB | Safe |
| Vacuum cleaner | 70 dB | Safe / Caution |
| Busy traffic / Horn | 75 dB | Caution |
| Compressor (plant room) | 82 dB | Exceeds limit (Industrial Night) |
| Factory floor noise | 85 dB | Caution |
| Loud machinery | 100 dB | Hazardous |
| Jackhammer / Drilling | 110 dB | Hazardous |
| Jet engine (close range) | 120+ dB | Hazardous (Pain threshold) |
Noise Monitoring & Testing Company
Perfect Pollucon Services is a leading Noise Level Testing Company in India. We have highly trained and highly experienced professionals who can take care of Noise level Monitoring or testing.
Noise level Monitoring Procedure
Noise level measurement procedure are processes which record sound level or acoustic energy level in the specified area. Sound or Noise level meter measures noise in Unit decibel (dB). We will see what are important factors to keep in mind while measuring noise level. You can also read more about Noise level measurement procedure.
⚙️ DG Set Noise Compliance Estimator
Check if your DG set meets CPCB noise limits based on size, location, and acoustic enclosure status.
Noise Monitoring Checklist Before Audit
Below is the Noise Monitoring Checklist Before an Audit:
- Calibrated noise meter ready
- Monitoring plan (zone, time) aligned with CPCB
- All log sheets up-to-date
- DG set data recorded
- Analysis report reviewed by competent authority
Noise Level Monitoring Instruments
Selecting the right sound measurement equipment is essential for precise noise level evaluation, especially in environments with fluctuating ambient sound levels..
Below are some of the popular Noise Level Meter Instruments available in market:
- Brüel & Kjær 2250 Handheld Sound Level Meter: Known for its precision and versatility, it offers advanced functionalities and is widely used in professional applications.
- SVANTEK SV 971 Sound Level Meter: Highly regarded for its compact design, ease of use, and robust features, suitable for various noise measurement tasks.
- RION NA-28 Sound Level Meter: Renowned for its accuracy and user-friendly interface, it is ideal for professional noise measurements.
- Extech 407730 Digital Sound Level Meter: A budget-friendly option with good accuracy and user-friendly features for general noise measurements.
- TES-1358 Sound Level Meter: Known for its affordability and portability, making it a suitable choice for basic noise level measurements.
- Cirrus Optimus+ Sound Level Meters: Offers a range of models with advanced features for different applications, known for their reliability and precision.
- 3M Quest EDGE Personal Noise Dosimeter: Designed for personal noise exposure monitoring, providing accurate data for compliance assessments.
- Casella CEL-633A1 Sound Level Meter: Offers a wide dynamic range and real-time octave band analysis, suitable for detailed noise studies.
- Testo 815 Sound Level Meter: A compact and reliable option for general noise level measurements.
- Norsonic Nor131 Sound Level Meter: Known for its ruggedness and high-quality measurements, suitable for various industrial applications.
Explore the best sound meters available for industrial settings here →
How do Noise monitoring devices work?
Noise monitoring devices work by capturing sound waves through a microphone and converting them into electrical signals for analysis. These devices measure sound levels in decibels (dB) and often include filters to focus on specific frequency ranges, such as those most harmful to human hearing.
Advanced noise monitoring equipment, like sound level meters and dosimeters, can log data over time, enabling users to assess noise exposure patterns. Some devices are equipped with real-time displays and alarms to signal when noise levels exceed permissible limits, while others integrate with software for detailed reporting and compliance tracking.
A Hilarious Perspective on Advantages of Noise Pollution
Noise Pollution Monitoring System using IoT
A noise pollution monitoring system utilizing IoT technology represents a cutting-edge approach to addressing the challenges posed by excessive noise in urban environments. By deploying a network of smart sensors equipped with noise detectors, this system continuously gathers real-time acoustic data from various locations.
This data is then transmitted to a centralized platform via the Internet, where it is processed, analyzed, and visualized in user-friendly interfaces accessible to relevant stakeholders, such as local authorities, environmental agencies, and the general public.
By harnessing the power of IoT, this monitoring system empowers cities to identify noise pollution hotspots, enact timely interventions, enforce noise regulations, and engage in evidence-based urban planning to create healthier and more liveable urban spaces.
These smart solutions are now part of modern noise pollution mapping services, offering real-time sound level insights and enabling faster action on environmental noise concerns.
Noise Monitoring / Testing Services
We offer Noise monitoring services to measurement noise pollution for D.G. stacks, traffic, machines etc. Our professionals use technically advanced monitoring and analysis tools. We offer Noise Quality monitoring services as per national standards and regulations backed up by timely execution, efficient professionals and cost-effectiveness.
Learnings from 25 Years of Noise Monitoring
✅ Proper noise monitoring can reduce regulatory violations by 50%.
✅ Strategic placement of noise sensors improves data accuracy.
✅ Regular noise audits help industries implement effective control measures.With decades of experience, Perfect Pollucon Services ensures industries meet noise pollution standards efficiently.
Noise Testing Services
We offer Noise testing services in customized options for 24 hours and multiple sites as per demands of our clients, environmental agencies, furnace units, chemical plants and conveying units.
How Perfect Pollucon Services Ensures Accurate Noise Monitoring?
Our expertise ensures effective noise pollution control and compliance.
Perfect Pollucon Services provides:
✅ Regulatory compliance testing as per CPCB/SPCB noise limits.
✅ Real-time & periodic noise monitoring for accurate data analysis.
✅ Custom noise reduction solutions for industries, commercial zones, and residential areas.
What is the Noise monitoring as per Factory Act 1948?
Under the Factories Act of 1948, noise monitoring is an important aspect of ensuring workplace safety and protecting workers’ health. The Act mandates that employers take necessary measures to prevent excessive noise exposure, which can lead to hearing loss, stress, and other health issues. Noise levels in industrial settings must be regularly monitored to ensure they stay within permissible limits set by regulatory authorities. This involves using sound level meters and dosimeters to measure noise exposure and identify areas where control measures are needed. By maintaining acceptable noise levels, factories not only comply with the law but also create a safer and more productive environment for workers.
In addition to monitoring, the Act requires employers to implement noise control measures such as installing silencers, using soundproofing materials, or modifying machinery to reduce noise emissions. Workers must also be provided with personal protective equipment like earplugs or earmuffs to minimize their exposure to harmful noise. Regular training and awareness programs are essential to educate employees about the risks of noise pollution and the importance of using protective gear. By addressing noise hazards proactively, the Factories Act of 1948 helps ensure that industrial workers are shielded from long-term auditory and health impacts caused by excessive noise.
Noise Monitoring
Perfect Pollucon Services provides expert noise monitoring services to continuously assess noise levels in various environments. Using state-of-the-art equipment and adhering to regulatory guidelines, the company offers real-time monitoring and comprehensive reporting for industries, construction sites, and urban areas to ensure compliance with noise pollution standards. These services are vital for identifying excessive noise levels, protecting public health, and maintaining environmental quality. Perfect Pollucon Services helps clients implement effective noise control strategies, ensuring a safer and more compliant sound environment for surrounding communities.
Read more about Noise monitoring Guidelines by CPCB
Our Special Features for Noise Testing Services:
- Cost competitiveness
- Eco friendly
- Time adherence
- Legal compliance
Need a Noise Compliance Report?
Our experts will visit your site, measure noise as per CPCB, and deliver a certified report. Trusted by 500+ companies.Request Free Quote →
✅ Reviewed by Our Expert Leadership Team
This service offering is created and reviewed by our senior team of environmental professionals with 10–40 years of experience in pollution control, regulatory compliance, and monitoring services.
Tanaji S. Gajare
Founder & Chairman
40+ years in air & water monitoring, sustainability leadership
Anil Shelke
Executive Director
30+ years in compliance, audits, and ETP/STP operations
Kunal Gajare
Environmental Engineer
10+ years in stack monitoring, MPCB/MoEF clearances, EIA
Last reviewed by Perfect Pollucon Services: June 2025.
CPCB norms and real-world implementation tips are regularly updated.
“Based in Mumbai - Maharashtra, PPS provides on-site noise level monitoring and testing across Thane, Mumbai, Navi Mumbai and adjoining Maharashtra industrial belts. Whether you operate a factory in Vashi, a construction site in Kalyan, or a residential compliance check in Mulund, our local Thane/Mumbai team is ready. We are fully familiar with local regulations under the Maharashtra Pollution Control Board (MPCB) and the Mumbai Metropolitan Region Development Authority noise norms, so you’re getting not just measurement but navigation of your local compliance-ecosystem.
For example, under the MPCB’s ‘Silent Zone’ criteria around hospitals and educational institutions in the Mumbai region and the MMR area, typical ambient night limits fall to 45 dB(A) / ~50 dB Leq - and PPS’s Thane team has been called in repeatedly to ensure full compliance in these zones.
Health Impacts of Excessive Noise
Prolonged exposure to noise above 85 dB(A) (typical industrial zone limits) can lead to: hearing loss, tinnitus, elevated blood pressure, stress, sleep disturbance and reduced productivity. In residential or silent zones within the Thane/Mumbai area, nighttime noise above 45-50 dB(A) can interfere with sleep and well-being. By engaging PPS’s noise-monitoring services you are proactively protecting both workforce and community health.
Frequently Asked Questions:
There are three types of Noise pollution monitoring:
1) Spot Reading or basic noise level monitoring - in this method single reading is taken using handheld device
2) Continuous Noise level Measurements - In this method noise level meter is kept on tripod for set duration and it takes reading after every set period. This helps us to understand trends and anomalies in noises
3) Longer term Noise level monitoring - In this method, noise levels are monitored for longer period such as few months to several years by small intervals such as 5 mins, 15 mins, 30mins or 1 hour or more. This helps us to understand noise pollution patterns over longer period.
As per Perfect Pollucon Services, We can measure Sound levels using Sound level meter. It is measured in unit Decibel (dB). There are also some apps available for mobile devices but accuracy of those apps is not upto the mark.
If you don’t have Noise level meter then you can use certain mobile apps which can give you approximate noise levels. But for more accuracy you can contact environmental consultants in your nearby area as they will have professional devices to measure noise levels.
As per WHO, globally acceptable noise levels are 55 (dB) during day and 45 (dB) during night. Also, these criteria change based on exposure duration and locality such as hospitals, schools etc.
As per CPCB, The permissible limit in industrial areas is 75 dB during the day and 70 dB at night. Same for commercial areas during the day and night, it is 65 dB and 55 dB and 55 dB and 45 dB in residential areas.
Noise monitoring for industrial areas involves the systematic tracking and analysis of sound levels and patterns within manufacturing and production facilities. It aims to assess the impact of industrial activities on noise pollution, ensure compliance with noise regulations, and implement mitigation strategies to safeguard both workers' well-being and the surrounding environment.
The method of noise level monitoring involves using specialized equipment, such as sound level meters or noise dosimeters, to measure and quantify the intensity of sound in a given environment. These devices capture acoustic data, which is then analyzed to determine the sound pressure level, frequency distribution, and potential exposure risks, providing valuable insights into the noise environment.
Noise monitoring refers to the systematic process of measuring, recording, and assessing sound levels in various environments to understand the extent of noise pollution and its potential impact on human health and the surrounding ecosystem. It involves using specialized equipment to gather data, which is then analyzed to make informed decisions about noise management, regulatory compliance, and mitigation strategies.
Noise monitoring involves using sound level meters, dosimeters, or noise monitoring stations to measure and analyze sound levels over time. These methods help assess noise pollution, ensure regulatory compliance, and protect public health.
Noise exposure monitoring involves measuring and assessing the amount of noise a person is exposed to over a specific period, typically in a workplace or industrial setting.
It helps identify if noise levels exceed permissible exposure limits, which could pose risks of hearing loss or other health issues. The process ensures compliance with safety regulations and informs the implementation of noise control measures to protect individuals from harmful effects.
For a basic spot reading we typically spend 2-3 hours on-site. For 24-hour or longer trend monitoring (often required in Mumbai/Navi Mumbai mixed zones) we deploy data-loggers for 24-72 hours and deliver a full report within 3–5 business days.
Our quotation covers on-site measurement (travel within Maharashtra region), equipment calibration certificate, data-logging, analysis, report documentation and recommendations. We issue cost-effective packages for multi-site or multi-day monitoring.
If audit data shows your noise levels exceed norms (e.g., MPCB limit of 75 dB day / 70 dB night for industrial ambient in Maharashtra) we partner with you to identify corrective measures - installing silencers, acoustic enclosures, changing machinery layout - helping you avoid regulatory setbacks or legal challenges.
Noise Measurement Company
Please contact us for more information or avail our Environmental Monitoring services.
At Perfect Pollucon Services, we also support environmental audits and noise impact assessments for industries, ensuring that all noise pollution norms are met effectively. Our sound level surveys help in both temporary and long-term noise exposure monitoring.
📞 Need professional noise testing services for your site? Contact Perfect Pollucon Services today for expert noise level monitoring, industrial decibel assessments, and compliance audits across India.
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