There is no gas by the name of "air" because air is really combination of several gasses.
The gas you breathe in from the air is called oxygen.
Is called Gas
this gas is called nitrogen.
The air is called flimolenium gas
Gas embolism
Air embolism
A "gas furnace" is called a furnace, an "electric furnace" is called an Air Handler
Gas masks are sometimes called "APR" - Air Purifying Respirator.
air, which is a mix of several gasses
The gas produced when coal is heated in the absence of air is called coal gas. It is a mixture of various gases such as methane, hydrogen, carbon monoxide, and carbon dioxide.
Ammonia gas in the air can discolor brass by forming a greenish layer called patina on its surface.
That is called a vacuum.