Noise from a factory, workshop, production facility, ventilation system, compressor or other industrial equipment can become a serious problem when it regularly affects nearby homes. But hearing a noise and proving that it exceeds an applicable limit are two different things.
In Latvia, complaints about noise from economic activities and equipment can be investigated through the Health Inspectorate. The process may involve identifying the source, assessing the circumstances, carrying out professional measurements and, where an exceedance is established, requiring measures to reduce the noise. Each complaint is considered individually, and other institutions may also be involved depending on the situation.
What Can Cause Industrial Noise?
Industrial noise can come from many different sources. Production machinery, ventilation systems, refrigeration equipment, compressors, generators, pumps and other technical installations can all contribute to environmental noise around a business.
The source does not necessarily have to be a large factory. The Health Inspectorate specifically identifies noise complaints involving equipment such as ventilation systems, generators, heat pumps, production facilities and vehicle-related activities. Cabinet Regulation No. 16 also specifically addresses noise from economic activities and equipment, including ventilation, refrigeration equipment, compressors and lifts.
What Should You Do If an Industrial Site Is Too Noisy?
Start by documenting what is happening. Note where you hear the noise, when it occurs, how long it lasts and whether it is continuous or comes from particular activities. It can also be useful to record when equipment starts operating, when deliveries take place or when the noise becomes noticeably stronger.
If you know which business or installation is responsible, you may also choose to contact the operator directly. Some noise problems can be resolved when the source is identified and the business takes practical measures to reduce it. The Health Inspectorate's public reporting indicates that many businesses involved in noise complaints take voluntary measures to reduce noise.
Phone recordings can help illustrate what you are experiencing, but they should not be treated as a professional noise measurement. A recording does not by itself establish whether an applicable legal noise limit has been exceeded.
Where Can You Make a Noise Complaint?
For noise from economic activities and equipment, the Health Inspectorate is an important authority. Its guidance states that a person who suspects that noise from economic activity equipment or vehicles is affecting their health can submit a written complaint to the Health Inspectorate. The complaint should describe the problem and include the person's name, address, contact details and other information required for the authority to investigate the situation.
The Health Inspectorate's responsibilities include controlling compliance with noise limits from economic activities and equipment covered by the relevant regulations. This includes sources such as ventilation equipment, refrigeration equipment, compressors and lifts.
Not every noise complaint belongs with the Health Inspectorate, however. Noise associated with music and other public-order matters is handled by the relevant municipality, so the appropriate authority depends on the source and circumstances of the complaint.
What Happens After a Complaint?
There is no single procedure that applies identically to every complaint. The Health Inspectorate states that complaints are assessed individually and that the relevant institutions can be involved depending on the circumstances. These may include municipalities, building authorities, property managers and other responsible organisations.
The next step may therefore depend on the information provided in the complaint, the source of the noise and whether there is a reasonable basis for further investigation. Where an assessment of actual noise levels is necessary, measurements can then be arranged using the methodology required by the applicable regulations.
When Is a Professional Noise Measurement Needed?
A professional measurement becomes important when you need objective information about the actual noise level and whether it meets the applicable requirements.
Latvia's Cabinet Regulation No. 16 establishes environmental-noise limits for industrial objects according to the functional use of the surrounding territory. For example, for areas designated for detached, low-rise or farmstead residential development, the limits for industrial environmental noise are 55 dB(A) during the day, 50 dB(A) during the evening and 45 dB(A) at night. Different limits apply to multi-storey residential areas, public-use areas, mixed-use areas and other categories.
This means that there is not one industrial noise limit that applies to every property in Latvia. The relevant land-use category and assessment conditions have to be established before a measurement result can be correctly interpreted.
Who Should Carry Out the Measurement?
For noise measurements carried out under the conditions specified in Cabinet Regulation No. 16, the regulation requires measurements to be performed by laboratories accredited by the national accreditation institution or by an appropriately accredited laboratory in another EU Member State.
This distinction matters when the results are intended to support a formal assessment. A reading from a consumer sound meter or smartphone application may be useful for understanding that a problem exists, but it is not equivalent to a measurement carried out according to the applicable regulatory methodology by an appropriately accredited laboratory.
What Happens During an Industrial Noise Measurement?
A professional measurement starts with understanding the source and the circumstances of the complaint. The acoustic specialist needs to know what equipment is operating, when the noise occurs and where the affected property or other relevant measurement location is situated.
The measurement is then planned according to the applicable requirements. The current regulation specifies the relevant noise indicators and assessment methods, and measurements are made under conditions intended to represent the characteristic operation of the noise source and the relevant period being assessed.
This is particularly important for industrial sites where operating conditions can change. A production facility operating at reduced capacity may produce a different acoustic result from the same facility operating normally, so the measurement conditions need to be appropriate for the question being investigated.
Where Is the Noise Measured?
The correct measurement location depends on the type of noise and the applicable assessment method. For industrial environmental noise, Cabinet Regulation No. 16 provides for assessment in areas containing residential development and at a position two metres from the façade most exposed to the noise. The applicable functional use of the territory in the municipal spatial plan is also taken into account.
This is why measuring directly next to a machine does not automatically establish whether a nearby residential property is exposed to excessive environmental noise. The measurement needs to be designed around the applicable assessment criteria and the location that is being protected.
What Happens If the Noise Limit Is Exceeded?
If an applicable noise limit is exceeded, the next step is to address the source responsible for the exceedance. Cabinet Regulation No. 16 places responsibility for exceeding the noise limit on the person whose noise source causes the exceedance.
The Health Inspectorate can require responsible persons to take noise-reduction measures when an exceedance is established. The exact measures depend on the source and circumstances. They may involve changes to equipment, operating conditions or other technical and organisational measures intended to reduce the noise reaching affected areas.
A noise complaint therefore does not automatically mean that the business will be fined or forced to close. The important first step is establishing the actual situation and determining whether the applicable requirements are being exceeded.
Can the Noise Source Be Identified?
Sometimes measuring the overall noise level is not enough. An industrial site can contain several machines, ventilation systems or other sources operating at the same time, making it difficult to determine which one contributes most to the problem.
In these situations, additional acoustic investigation can be useful. An acoustic camera, for example, can help visualise the strongest sound sources around machinery or technical equipment. This can help identify where corrective action should be focused.
The two investigations answer different questions: a noise measurement can establish the level of noise at a relevant location, while an acoustic camera can help determine where the sound is coming from.
What If the Noise Only Happens at Night?
Noise that occurs only during certain periods can require a different measurement approach from continuous noise.
For example, a compressor may operate intermittently, deliveries may take place during particular hours, or a production line may operate differently during a night shift. In these situations, a short measurement taken during a quiet period may not represent the conditions when the complaint actually occurs.
Cabinet Regulation No. 16 distinguishes between day, evening and night periods and provides different environmental-noise limits for these periods and land-use categories. The measurement therefore needs to be planned around the relevant operating conditions and assessment period.
Can a Business Arrange an Independent Measurement?
Yes. An independent acoustic assessment can be useful for a business that has received a noise complaint, particularly when the source or actual noise level is uncertain.
The measurement can help establish the existing acoustic situation and determine whether further investigation is necessary. If the noise is excessive, identifying the source and understanding its contribution can help the business choose appropriate noise-control measures rather than making changes without knowing whether they will address the actual problem.
Where the results are intended for a formal assessment under Cabinet Regulation No. 16, the applicable accreditation and measurement requirements should be followed.
What Can Actually Resolve an Industrial Noise Problem?
There is no universal solution because the appropriate measure depends on the source and the way the sound reaches nearby properties.
Depending on the investigation, solutions can include modifying or replacing equipment, installing acoustic enclosures or barriers, improving the acoustic performance of a building element, reducing vibration transmission, relocating equipment or changing operating procedures. The most effective solution is usually the one that addresses the dominant source or transmission path rather than simply treating the symptom.
This is why identifying the source is often an important part of the process. Once the main contributor has been established, the business can focus its resources on measures that are more likely to reduce the actual noise exposure.
How Long Does the Process Take?
There is no fixed timeframe for every industrial noise complaint. The duration depends on the nature of the complaint, whether the source can be identified easily, whether measurements are necessary and whether additional investigation or corrective measures are required.
The Health Inspectorate's current information also shows that noise complaints can involve several institutions and that each case is considered individually. A straightforward case may require relatively little investigation, while a complex industrial site with intermittent noise or several potential sources can require a more detailed assessment.
What If You Are Not Sure What Measurement You Need?
You do not need to know in advance whether you need a standard noise measurement, longer-term monitoring or an acoustic camera investigation.
Start by explaining where the noise comes from, when it occurs and what you are trying to establish. If the source is unclear, an acoustic investigation may first need to identify it. If the source is known but the question is whether the noise level is excessive, a properly planned professional measurement may be the more appropriate starting point.
If you are not sure what you need, just contact us. We can discuss the situation, review the available information and help determine the most appropriate acoustic assessment.
Industrial Noise Measurements in Latvia
NoiseHunters provides professional industrial and environmental noise measurement services throughout Latvia. We can investigate noise from production facilities, machinery, ventilation systems, compressors, pumps, generators and other industrial or commercial sources.
Depending on the situation, the assessment can include professional noise measurements, longer-term monitoring, noise-source investigation and acoustic camera analysis. The aim is to establish what is happening acoustically and provide useful information for deciding what should happen next.
If you are a resident dealing with persistent industrial noise, an independent measurement can provide objective information about the acoustic conditions at your property. If you are a business dealing with a noise complaint, an acoustic assessment can help establish the actual noise level, identify potential sources and determine whether further noise-control measures may be appropriate.
If you are not sure which service you need, just contact us. Tell us where the noise is coming from, when it occurs and what you are trying to find out, and we can help determine the appropriate approach.
Disclaimer: This article provides general information about industrial noise complaints and the Latvian regulatory framework. The applicable noise limits, measurement methodology, responsible authority and required procedure depend on the source of the noise, location, land-use designation and circumstances of the case. Latvian regulations and administrative procedures may change, and the information above should not be treated as legal advice or as a determination that a particular noise source is compliant or non-compliant. For a specific case, consult the relevant Latvian authority and an appropriately accredited acoustic laboratory or qualified acoustic specialist.