🌿 Environmental noise measurement
In short
Measurement of sound level (noise) in the environment using Class 1 sound level meter. The test is performed according to PN-ISO 1996-1:2006, PN-ISO 1996-2:2017; Measurement range: 20–140 dB(A). The procedure comprises 7 steps (about 2 h 11 min–17 h 26 min in total); it is used for: Assessment of road and rail noise (2014 Polish regulation), Control of industrial noise from plants, City acoustic maps (Directive 2002/49/EC).
At a glance
- Standard: PN-ISO 1996-1:2006, PN-ISO 1996-2:2017
- Category: Environmental
- Procedure steps: 7
- Total time of stages: 2 h 11 min–17 h 26 min
- Main parameter: L_Aeq (A-weighted equivalent sound level)
- Measurement range: 20–140 dB(A)
- Meter class: Class 1 according to IEC 61672-1
Overview
Environmental noise is one of the most important factors affecting quality of life and human health. Standard PN-ISO 1996 defines methods for description, measurement, and assessment of environmental noise, including road, rail, air, and industrial noise.
The key parameter is the A-weighted equivalent sound level (L_Aeq), expressed in decibels (dB). The 2014 Polish regulation establishes permissible noise levels: residential areas — 50 dB (night) and 60 dB (day) for roads, 40/50 dB for industrial plants. Measurements are performed by accredited environmental laboratories and WIOŚ.
The method requires a Class 1 sound level meter (according to IEC 61672-1), calibrated before and after measurement, taking into account meteorological conditions, measurement time, and acoustic background.
TWO DESIGNATIONS IN ONE KEY — THE TAB SHOWED ZERO (23.09.2026). The key field had the form "PN-ISO 1996-1/-2": two part numbers glued together with a slash in a string that the program compares character by character with the record in the accreditation scope. Such a string cannot match anything, because no laboratory writes two parts in one line in this form. Measurement (23.09, copy of the scopes): "PN-ISO 1996-1/-2" 0 entries, "PN-ISO 1996" — 4 ENTRIES AT 2 LABORATORIES. The key has been set to the common prefix of both parts. TWO THINGS CAME TO LIGHT DURING THE MEASUREMENT AND BOTH ARE RECORDED HERE. First, PART 1 DOES NOT OCCUR IN THE SCOPES EVEN ONCE — all four records concern part 2 ("PN-ISO 1996-2:1999+A1:2002", AB 912 and AB 522), i.e. the part on the determination of sound pressure levels, not on basic quantities. Second, A THIRD LABORATORY (AB 1139) HAS THIS STANDARD, BUT REMAINS OUTSIDE THE MATCHING FOR A REASON THAT NO KEY CAN GET ROUND: its record reads "enia Ministra Klimatu i Środowiska z dnia 07.09.2021 r. (t.j. Dz.U. 2023 poz. 1706) PN-ISO 1996-2:1999/A1:2002" — the value is CUT OFF AT THE FRONT (the beginning of the word "Rozporządzenia" [Regulation] is missing), and the designation of the standard stands at its end. Matching works by the beginning of the value, so there is nothing there to match with.
Method principle
The sound level meter registers acoustic pressure using a capacitor microphone, processes the signal through an A-weighting filter (imitating human ear sensitivity), and calculates the equivalent sound level L_Aeq as the logarithmic energy average of acoustic pressure over a given measurement time. The result is expressed in dB(A) referenced to 20 µPa.
Applications
- Assessment of road and rail noise (2014 Polish regulation)
- Control of industrial noise from plants
- City acoustic maps (Directive 2002/49/EC)
- Environmental impact assessment (EIA)
- Construction site noise control
- Airport noise monitoring
Key parameters
| Parameter | Value |
|---|---|
| Main parameter | L_Aeq (A-weighted equivalent sound level) |
| Measurement range | 20–140 dB(A) |
| Meter class | Class 1 according to IEC 61672-1 |
| Limit (residential, day) | 55–65 dB(A) depending on source |
| Measurement uncertainty | ±1.5–3 dB (depending on conditions) |
Standard
- Standard number
- PN-ISO 1996-1:2006, PN-ISO 1996-2:2017
- Title (PL)
- Akustyka — Opis, pomiary i ocena hałasu środowiskowego
- Title (EN)
- Acoustics — Description, measurement and assessment of environmental noise
Step-by-step procedure
-
Measurement planning
Determine measurement point (1.5 m above ground, 3.5 m from building facade or on facade). Check weather forecast — wind <5 m/s, no precipitation.
-
Meter calibration
Attach calibrator to microphone. Verify reading 94.0 dB (±0.3 dB). Record calibration result.
-
Equipment setup
Mount meter on tripod. Attach windscreen. Point microphone toward noise source.
-
Noise measurement
Start recording. Measurement time: min. 8 h (day 6:00–22:00) or 1 h (night 22:00–6:00) for road noise. For industrial noise — source operation time.
-
Background noise measurement
Measure background level with noise source turned off (if possible). Background correction required when difference <10 dB.
-
Final calibration
Repeat calibration after measurement. Deviation ≤0.5 dB from initial calibration.
-
Calculations and reporting
Calculate L_Aeq with background and meteorological corrections. Compare with permissible levels. Prepare measurement report.
Required equipment and apparatus
| Equipment | Example | Indicative price |
|---|---|---|
| Class 1 sound level meter | Brüel & Kjær 2250, SVAN 971, Norsonic Nor140 | 15,000–50,000 PLN |
| Acoustic calibrator | Brüel & Kjær 4231, SVAN SV 30A (94 dB, 1 kHz) | 3,000–8,000 PLN |
| Tripod with windscreen | 1.5 m tripod + Ø 90 mm foam | 500–2,000 PLN |
| Weather station | Davis Vantage Pro2 or Kestrel 5500 (wind, temp., humidity) | 2,000–8,000 PLN |
Health and safety (OHS)
- Field work — reflective vest near roads
- Mind weather conditions — do not measure in rain and strong wind
- Measuring equipment — protect from moisture and drops
- Near roads — maintain safe distance from traffic
Frequently asked questions
Which standard describes this test?
The test is performed according to PN-ISO 1996-1:2006, PN-ISO 1996-2:2017 — “Acoustics — Description, measurement and assessment of environmental noise”.
How does this method work?
The sound level meter registers acoustic pressure using a capacitor microphone, processes the signal through an A-weighting filter (imitating human ear sensitivity), and calculates the equivalent sound level L_Aeq as the logarithmic energy average of acoustic pressure over a given measurement time. The result is expressed in dB(A) referenced to 20 µPa.
What is the measuring range and accuracy?
Main parameter: L_Aeq (A-weighted equivalent sound level); Measurement range: 20–140 dB(A); Meter class: Class 1 according to IEC 61672-1; Limit (residential, day): 55–65 dB(A) depending on source.
How long does the test take?
The times given for the individual stages add up to approximately 2 h 11 min–17 h 26 min. The procedure comprises 7 steps.
What equipment is required?
Class 1 sound level meter, Acoustic calibrator, Tripod with windscreen, Weather station. Indicative cost of the core instrument (Class 1 sound level meter): 15,000–50,000 PLN.
Where is this test used?
Assessment of road and rail noise (2014 Polish regulation); Control of industrial noise from plants; City acoustic maps (Directive 2002/49/EC); Environmental impact assessment (EIA); Construction site noise control; Airport noise monitoring.
What safety precautions apply?
Field work — reflective vest near roads; Mind weather conditions — do not measure in rain and strong wind; Measuring equipment — protect from moisture and drops; Near roads — maintain safe distance from traffic.
Which laboratory can perform this test?
The test is performed by laboratories accredited to ISO/IEC 17025. On LabCoda you can find them by the standard number PN-ISO 1996.