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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!).
But the smell at the seaside is not even ozone. It's a very different chemical called dimethyl sulphide, or DMS.DMS is a clear inflammable liquid under 38oC, but can exist as a gas at lower temperatures. It has some industrial uses - from enhancing corn flavours in food, to refining petrol. It is also one of the main odours in black truffles (which are delicious underground fungi), but it rapidly fades upon exposure to air.
The Black truffle or Black Périgord Truffle (Tuber melanosporum) is named after the Périgord region in France and grows exclusively with oak.... Black truffles on these markets sell between €200 and 600 per kilogram (USD$130–$380 per pound), depending on the quantity and quality of the harvest.
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.