Bloom air around instruments

Bandwidth is important in the electronics, as poor bandwidth results in phase shift.
To prevent phase shift in the audible region of 20Hz to 20KHz you need bandwidth from 2Hz to 200KHz.

I use a hairdryer with good results!

Old Chinese saying: "If want to learn much, first read what has
already been said."  

(It also may help to define your terms, outside horticulture.)

https://forum.audiogon.com/discussions/recommendations-for-improving-visceral-impact/post?highlight=air%2Bionizer&postid=1712871#1712871

and probably many, many other posts, through the years.

The ambient sounds of the area the recording was recorded in.  By area ...indoor (Studio) vs indoor (concert hall/non-studio building) vs. outdoor area.    Some like to call this "air" which is fine, but it would seem that the "sound" of the recording area is most likely that "air".