Three-letter acronym.

Yeah.

[laughs] This is a four-letter one anyway.

Chronic obstructive pulmonary disease.

So chronic means long-standing.

Obstructive means the picture we get when you breathe out.

So you blow into a machine, and it has a picture of obstruction.

What are things either domestically at home or, or in the, in the outside world that, that are sources of air pollution, especially things people can fix?

Tell us a little bit about then what happens when we take a breath.

Yeah.

So you've touched on it already.

The aim of taking a breath is to get air, which as we've said contains oxygen, into the lungs and to get rid of carbon dioxide, which the body has made.

So the lungs are like bellows, and you've got to open the bellows to suck in air.

We have a muscle.

The main muscle we use is, is not the muscles in the chest, it's the muscle below the diaphragm.

[laughs]