Wolfel - IMMI
For more than 20 years, service providers, authorities and industrial companies have been relying on IMMI as one of the leading software tools in the field of immission control. IMMI is a software package for the calculation of sound propagation outdoors, noise exposure in workrooms and propagation of air pollutants.
The history of the IMMI prognosis software dates back to the early 1980s. The first commercially available IMMI software was launched in 1987 by Wölfel acoustic engineers – a technology company which has over 100 employees today.
In cooperation with other acoustic engineers and software manufacturers in Germany, the IMMI team has played an important role in the worldwide establishment of the quality standard of immission prognosis that is common today. As founding members of the standards committees for DIN 45687 and ISO 17534, they have made a major contribution to the quality standard that serious products in this field have to meet.

Knowledge Hub
Why Type Approved Certification Matters
October 13, 2025
When you’re choosing a noise monitoring system, you want to have trust in that kit and you need to know the data that you are collecting is accurate, reliable and defensible. Sometimes behind the impressive branding and technical specs, the calibration certificate that comes with the instrument doesn’t really tell…
Statement From Airly CEO, Wiktor Warchałowski
October 3, 2025
First and foremost, IAQM Position Statement touched on the very important point related to accuracy of measurements when using small sensors for carrying out professional assessments. Airly is using the principle of light scattering, functioning as an Optical Particle Counter (OPC). Here is a brief overview of the process: An…
AcSoft are Exhibiting at Environmental Services & Solutions Expo
August 14, 2025
We are pleased to announce we are exhibiting at the Resource & Waste Management Expo which is part of the ESS Expo located at the NEC in Birmingham taking place on the 17th- 18th September. You will find AcSoft on stand ME-B236 in hall 18. The Resource & Waste Management Expo…
Introducing SvanLINK – A *NEW* Solution to Live Event Monitoring
August 4, 2025
Whether you’re managing a live event, presenting at a conference, or simply need real-time visibility of your noise data, SvanLINK is here to make it easier than ever. Introducing SvanLINK, a new solution from Svantek that allows you to view live decibel readings from your sound level meter directly on…