Here is the third point.
As stated before, science tells us that air is nothing more than oxygen and nitrogen with a few insignificant other substances. Science also tells us that our lungs only exist to take oxygen out of the air and dump waste products back to nature.
However, we know from experience that lungs can absorb all kinds of toxic substances from the air. This is one of the reasons why people who live surrounded by pollution end up full of heavy metals.
How can this be? Why would Nature, evolution, or Creator provide human beings with lungs capable of absorbing substances other than oxygen if air is 'empty' of any nutritive value? Again, what kind of wasteful design is this (pun intended)?
If we assume however, that Nature, evolution, or Creator made no mistake in the design and function of the lungs, this would mean that the body is not only meant to receive nutrition from the air through the skin (as noted before) but also through the lungs.
Could it be, as said before, that what's in the air and perhaps more importantly what's no longer in the air does and has always mattered?