I cannot abide those who leave their engines running for an inordinately long time whilst parked up or awaiting someone to return to the vehicle, completely oblivious to the cloud of obnoxious fumes and pollution they have created around them and through which I as a pedestrian now have no choice but to walk through. When will people learn to SWITCH OFF THEIR ENGINES - DON'T LEAVE THEM RUNNING WHEN THE VEHICLE IS PARKED! 
