A smoky car with overflowing ashtrays, which has stood in the sun for a couple of hours, would be ranked ‘5 – Highly unpleasant’ on the Volvo Cars smell test scale. The odour in the passenger compartment of a car is evaluated on an international scale from 1 to 6. The test is carried out using ‘standard’ noses and a sunshine simulator, which is capable of shining as brightly as the Mediterranean s...