Nitric acid, nitrous acid, sulfuric acid and sulfurous acid. At the concentrations produced they are primarily irritants and not all that harmful. Although I have seen people burned by the acids when using higher powered machines with air in an ozone tent. The acids are formed when the oxides react with moisture such as sweat. Ozone and these acids can induce asthma attacks in those prone to asthma though due to the irritation.  This is another reason to be careful and keep excess ozone away from the lungs. I tell people to keep a fan blowing in their face when using ozone near the face, such as ear insufflation,  to keep from inhaling the ozone. There are other potential side effects when using ozone for therapy such as damaging the intestinal lining and hemolysis of red blood cells. But these only occur when using concentrations of ozone higher than therapeutic levels. This is why it really helps to know what you are doing with ozone, especially when using it internally. Otherwise it is one of the most effective and safest therapies available for a number of disorders and injuries. A study in Germany followed a number of people receiving ozone therapy. There were over 6.5 million doses given between all the patients and just over 30 adverse reactions reported.  Most of these were minor such as irritation at the injection site. No mainstream therapy has anywhere near this safety record.

>>And ozone can split some molecules creating all new compounds.

Where can I purchase the handbook? ; ) Seriously - how does one know what breaks down to what?

That information is not easy to find. I have a list somewhere that shows the chemical reactions between ozone and a number of chemicals such as formaldehyde.  Going back 15+ years ago it was extremely difficult to find information on ozone therapy so everything I could find I collected and added to a reference binder. So I have the list in that binder. Some things are pretty easy to figure out if someone has a chemistry background. Such as ozone will react with carbon monoxide to form carbon dioxide. Formaldehyde (CH₂O) is broken down in to carbon dioxide, water and oxygen. But it can get a little more complicated since higher concentrations can be used to do things that lower power units cannot do. For example I have used my monster at home ( a 4 foot cold corona discharge tube hooked up to 15,000 volts) in various experiments to split molecules in organic chemistry experiments. I won't go in to details on this because these are for things I eventually hope to patent and sell to industry. Point is though that I could not do this with a machine designed for therapy because the concentrations of ozone used for therapy is miniscule.

One example though of higher amounts of ozone being used in a similar manner is many companies use ozone to split salt in water to produce chlorine compounds for therapy.  Basically ozone reacts with saltwater (sodium chloride in water) to form sodium hydroxide and chlorine dioxide. The chlorine dioxide further oxidizes in to a hypochlorite. And hydrochloric acid is added to the solution to buffer the caustic sodium hydroxide back in to sodium chloride. Kind of a roundabout way to produce saltwater and bleach

They are even using ozone injection in some washing machines as a "non-chlorine bleach" alternative.