Before the current VW scandal surfaced there were concerns being raised about the effect of Diesel engines on Air quality. Looking back a few years the main culprits were commercial vehicles, most of us will remember the belches of blue/black fumes from exhausts. Clearly some progress has been made yet the compensation lawyers are hovering in expectation of the next great commercial give away. So who is right, who is to blame and will you give up your car to reduce the impact on the environment?