I use a compound that contains (depending on atmospheric pressure) approximately 78% Nitrogen, 21% Oxygen, 1% Argon, and .03% CO2 among other chemicals. My entire listening environment is saturated with it. I have an electronically actuated system which contstantly monitors temperature changes and initiates a circulation of this substance around my entire temperature-controlled environment.

Although you can buy some of this in small doses as seen here , I prefer to obtain my own from the environment where I live.