Hi All,  I have not read all the correspondence, but a few points need
clearing up here.  Ozone is named after a German word having a meaning
related to smell.  Its smell is rather like chlorine in bleach.

Ozone is _not good_ for man nor beast nor rubber tube (which rots in
seconds) and it should not be confused with excesses of positive or
negative ions often present where one medium (liquid or gas) rapidly
moves over another (often over a solid).  I do not know if there is
scientific evidence to show that [charged] ions are good for you,
but it is often claimed they are.

Regarding oxides of nitrogen, I strongly suspect it is nitrogen dioxide
which your correspondent can smell.  This too has a bleach-like odour.
Excess inhalation was said to cause septic pneumonia.  Unlike nitrous
oxide ["laughing gas"], it is NOT a laughing matter.

Around an electric discharge there certainly _is_ a higher concentration
of ozone, but in these days of holes in the ozone layer, my advice is
-- run all the old motors you can, whilst trying not to breath too much
of the stuff into your lungs.  Just a thought.

Paul Morris