Afew minutes after spraying perfume on yourself, you don't smell the perfume anymore, even though people you come in contact with can smell it. one possible explanation is that

One possible explanation is that you've become nose blind to the scent of the perfume. You're wearing the perfume, so you quickly get used to the scent and soon don't notice it anymore, whereas other people notice the scent because they are not nose blind to it.

Reduction in overall biodiversity