VDI 3940 Blatt 2-2003 Determination of odorants in ambient air by field inspections - Determination of the frequency of identifiable odour in ambient air - Plume measurement
2006VDI 3940 Blatt 2-2006 Measurement of odour impact by field inspection - Measurement of the impact frequency of recognizable odours - Plume measurement
2003VDI 3940 Blatt 2-2003 Determination of odorants in ambient air by field inspections - Determination of the frequency of identifiable odour in ambient air - Plume measurement