A particular challenge to effective noise monitoring in built up areas is noise that comes from a variety of sources other than the construction site, such as road traffic. When noise limits are exceeded, it must to be possible to determine if that noise was construction-related or from something else.
In this case, noise limits are frequently breached by passing ambulances, and by helicopters landing at the nearby hospital.
The Noise Sentinel Real Time Control App can be viewed online and is optimised for site managers - showing a variety of noise information. Current noise levels are shown in real-time and updated every second. The history of the noise at each location is also shown.
When a noise alert is detected it is clearly flagged up so the operator can listen to audio recorded at the time of the exceedance to determine if it was construction-related. Events like a helicopter flying overhead at the time are likely to be heard on the ground and be obvious at the time of the exceedance. However, when reviewing noise exceedances days later with the local council, being able to replay the audio and prove that the exceedance was not construction related is a powerful capability.