VDI/VDE 3518 Part 4 is a new technical guideline that defines standardized test procedures and test-gas mixtures for VOC detectors used in indoor air quality (IAQ) measurements. Titled "Multigas sensors – Standardized test instructions and test gases for VOC detectors for indoor air quality measurement" it was published in April 2025 under ICS 71.040.40. This 42-page guideline aims to ensure that VOC-detector measurements are comparable and reproducible across different sensor technologies and manufacturers.
The guideline is primarily aimed at manufacturers of VOC detectors and multi-gas sensors, testing laboratories, certification bodies, and experts in indoor air hygiene and building services engineering. It provides a framework for evaluating sensor performance, including sensitivity, selectivity, response time, and long-term stability. By defining standardized environmental conditions, gas mixture compositions, and test sequences, VDI/VDE 3518 Part 4 establishes a methodology designed to enable more reliable assessments of indoor air quality. Does it succeed? Read on to find out.

