Snot comes in many colours depending on what's happening up your nose. But be careful with how you use nasal spray

abc.net.au/news/green-snot-deep-sinuses-facts-mucus-noses-nasal-sprays/102444976Our noses perform important functions every day of our lives, but we often only notice when disease changes how they work.

But what are sinuses? What about the snot colours? What's that squeaky sound in your ears about? And is there a correct way to position nose spray? Dual cavities extend up and also back from the nostrils, and have multiple bony folds that create a larger surface area for the nasal cavity to be an effective filter and air conditioner.80 per cent of suspended particlesThe nose has a very rich blood supply just under the skin lining which acts as a heat exchange.

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