"love is in the air"?

Whether Love happens to you, Hate happens to you, Anger happens to you, Misery happens to you, Joy happens to you, it only happens within you, isn’t it? So there is no air involved..

So, you say ‘Love is in the air’ when you are feeling pleasant in your emotion, when you feel pleasant, suddenly air feels vibrant. It always be but you missed it all in your life. Now you begin to feel it so you call it as Love is in the air.