It doesn't actually do anything other than make someone pay attention to their breathing. These days first aid training recommends things like counting on your fingers or putting your hand on your tummy and trying to lift it with your breath, not least because no one has paper bags handy anymore.

One of the challenges is that in a very low pressure, dry atmosphere like on Mars, electrostatic effects on dust are very powerful. This means that a dusty surface is harder to clean. You know if your TV has dust on the screen, and you wipe it, but you can never seem to get all the dust off? It's like that but turned up to eleven.

Obviously when dust buildup gets bad enough, cleaning would still be beneficial, but it's always going to be harder than a quick brush or wipe.