The phrase "am air" is a Gallicism that means "in the atmosphere" or "in the air". To convey a similar meaning, there are many other expressions or synonyms you can use. For instance, "floating around" is often used to describe something that is in the air or uncertain. You can also say "up in the air" to indicate a lack of clarity or firm commitment. Another synonym for "am air" is "pending" or "undecided". Other words that convey the concept of being in the air include "fluctuating", "unresolved", and "indeterminate". Choosing the perfect synonym depends on the context and intended meaning.