There is no data for the T-value. The environmental information comes from Fass.se.
Fass environmental information for Propavan (propiomazine) (downloaded 2018-07-03).
Persistence: "No degradation data are available."
Bioaccumulation: Log Pow = 4.79.
Chronic toxicity: No data available.
"The PEC/PNEC ratio could not be determined since no ecotoxicological test results are available."
Author: The Pharmaceutical unit of Region Stockholm