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Ozone is a colourless odourless poisonous gas (so at the sea-side it is not the ozone you smell but more likely rotting seaweed!).
Many many websites state that ozone is odourless.??NASA Goddard (on one site) claim the spark smell is ionisation of air or oxygen?? The process of creating ozone. Ozone itself is odourless Other sites claim that the smell is nitric oxide and in fact electrical sparks can be used to produce nitric acid.
I am not convinced either way.