Perhaps even a drug of some sort: a drug released into the air.

As a result of their activity, they are released into the air.

I really did release it into the air just now.

The fear is that the construction may release asbestos into the air.

Peering inside, she explored the thing that had released the name into the air.

In addition, they release water into the air during photosynthesis.

It can also be released into the air through the burning of coal, gas, and oil.

But eventually that heat will be released from the ocean's surface back into the air, he and others said.

How might balloons released into the air affect the environment?

This had come through some obscure work on light done years before, with the result that energy could be released directly into the air.