Fig. 6
The measured OAC using PAS as a function of different engine loads and T = 250 °C (squares), and OAC of OM (\({\text{OAC}}_{\text{OM}}\left(\uplambda \right)\)) values evaluated using Eq. (2) (circles). The vertical lines at 266 nm show the point where we quantify the OM content in exhaust PM.
