Rambling: Riddle

It moves but is always there.
It can hold things but has no arms.
It be taken in and pushed out but cannot be touched.
It is necessary for life yet too much of it can be deadly.
What is it?

Air
Air moves (the wind) yet there is always air around you, even if the wind blows.
Air can hold things such dust, leaves, and water vapor.
Air is taken in when you breathe and pushed out by ventilation fans yet it is intangible.
Without air, we cannot live, yet too much of it (too much pressure) kills.