ozone + water = nitric acid

 I'm learning more and more about ozone. This site is very informative... but they sell saunas and lots of ozone products so they are biased..... www.o3center.org/Articles/TheStoryofOzone.html

This is from wiki...

Corona discharge method

This is the most popular type of ozone generator for most industrial and personal uses. While variations of the "hot spark" coronal discharge method of ozone production exist, including medical grade and industrial grade ozone generators, these units usually work by means of a corona discharge tube. They are typically very cost-effective and do not require an oxygen source other than the ambient air. However, they also produce nitrogen oxides as a by-product. Use of an air dryer can reduce or eliminate nitric acid formation by removing water vapor and increase ozone production. Use of an oxygen concentrator can further increase the ozone production and further reduce the risk of nitric acid formation by removing not only the water vapor, but also the bulk of the nitrogen.

en.wikipedia.org/wiki/Ozone