Because she objected to the smell of curry, apparently. From the Guardian:
A teacher has been banned from classrooms after spraying children of Asian origin with air freshener if she said she smelled curry.
Elizabeth Davies, 48, was struck off for at least two years for the way she treated children in her primary school class.
A disciplinary hearing was told that Davies would say: “There is a waft coming from paradise” before using the air freshener. She was accused of having a “smug look” as she sprayed children in the class, where half the pupils were of Bangladeshi origin.