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Longman Dictionary of Contemporary English
sea air
noun
EXAMPLES FROM CORPUS
▪ A few days of sea air would not hurt them.
▪ After the stale fug in the tiny cabin, she gulped down the clean sea air, the car window wide open.
▪ He gave me to understand that the bamboo beetle would soon be killed off by the sea air.
▪ Hunger and a need for sea air drove Ruth down to the Puerto de Pollensa.
▪ Near the coast also the sea air reduces the cold of late winter and spring.
▪ Nothing ever really dried out now that it was so thoroughly impregnated by salt sea air.
▪ Swore the sea air was doing his health good.
▪ That was back when our unofficial city aroma was strong coffee and sea air, not urine.
Wikipedia
Sea air

The air at or by the sea is traditionally thought to be healthy. This was variously attributed to iodine or ozone but its cleanliness or salt may be more significant.

Salts generally do not dissolve in air, but can be carried by sea spray in the form of particulate matter.

In modern times, the quality of this air is now degraded by pollution from shipping which burns high sulphur fuel in its engines and so generates large quantities of sulphate aerosols.

Usage examples of "sea air".

Breathing in the sea air and salt spray kicked up by the bow behind the conning tower's weather screen, Hersing took every opportunity to leave the close confines of the pressure hull with its smell of dampness, diesel fumes, and sweat.

Indeed, his grandfather had been born here, in a small house very near Ardmore Bay, had lived the first years of his life breathing that moist sea air, had perhaps held his mother's hand as she'd walked to the shops or along the surf.

And then she and Sexton will meet in the bedroom, her husband undressed and waiting for her between the sheets (ironed just that day, because two days in the sea air puts the wrinkles back in), and the notion of a fresh start will have vanished like a song.

I hope you boys didn't get too tired after all that sea air we gave you the other day.

They stood there daintily, their pink noses raised, sniffing the salt sea air.

The smell of burnt flesh wafted off the corpse, fouling the sea air.

Those were open, slid back to let in the mild, silky warmth of the sea air above Capricorn, and strands of her yellow hair floated free in the breeze.

The sea air--I could smell the salt from where we stood--was busy rusting them out.

Just from the brief walk along the deck, her scent was blended with the sea air.