ozone

otsoni puhekieltä An allotrope of oxygen (symbol O3) having three atoms in the molecule instead of the usual two; it is a blue gas, generated from oxygen by electrical discharge.
puhekieltä fresh Fresh air, especially that breathed at the seaside and smelling of seaweed.
1875, (w), The Chemical News, http://books.google.com/books?id=teUEAAAAQAAJ&pg=RA1-PA99&dq=%22ozone%22+seaweed+-%22ozone+-layer%22&hl=en&ei=YlCYToyjC-PxmAWV-sGeAg&sa=X&oi=book_result&ct=result&resnum=1&ved=0CC4Q6AEwADgKv=onepage&q=%22ozone%22%20seaweed%20-%22ozone%20-layer%22&f=false page 99,

A patent obtained in England, and specified far from clearly, for obtaining ozone by boiling seaweed,†† may be mentioned as a curiosity, and also the credulity with which ozone-baths, prepared in this manner, find a ready sale, in spite of, or perhaps rather on account of, their high price.

To Ramsgate baths she sped, in quest / Of seaweed and ozone ; / For seaweed and ozone were best, / They said, to give her tone.

It's got the lot: fresh sea air, ozone, seaweed. You could cut the air with a knife.

Whenever it exists, as it usually does, even where the tide water freshens at the ebb, it seems to have a purifying tendency, probably by ozoning the superincumbent atmosphere.

I worked nonstop to make the house safe. Periodically I ozoned the first-floor bathroom, but it still made us sick.