Propylene

CAS RN: 115-07-1

Odor Threshold

... between 39.6 and 116.27 mg/cu m.
Propylene has odor thresholds of 10-50 mg/cu m (detection) and about 100 mg/cu m (recognition), and an organoleptic limit of 0.5 mg/L.
Find more information on this substance at: PubChem, PubMed