Industrial / EIA
Factory boundary noise measurement for EIA compliance
A manufacturing plant in an industrial estate needed boundary noise and nuisance-noise measurements under its EIA conditions. We planned the measurement points, collected 24-hour data, and delivered a report accepted by the regulator.
The problem
EIA conditions required regular boundary noise measurement, with community concern about night-time nuisance noise.
Our approach
- 1Set measurement points along the boundary and at community receptors per Pollution Control Department guidance
- 2Measured 24-hour Leq and nuisance-noise levels (background vs. intrusive noise)
- 3Identified dominant sources with frequency analysis to target cost-effective controls
- 4Reported in the regulator's required format with instrument calibration certificates
Standards applied
Key numbers
42 dBA
24-hr boundary Leq
6 dBA (limit 10 dBA)
Nuisance noise level
8
Measurement points
Outcome
The highest 24-hour boundary Leq across the eight points was 42 dBA — 28 dB below the 70 dBA limit in NEB Notification No. 29 (B.E. 2550). The corrected nuisance-noise difference at the nearest community receptor peaked at 6 dBA, inside the 10 dBA threshold of the MNRE notification (B.E. 2565). The report was accepted for the EIA reporting cycle, with engineering noise-control recommendations for the dominant sources.