Dave Doe wrote in
:

Water is pollution?

I think you either need to get your chemistry right, or define
"hydrogen" - or perhaps, what you are burning. Hydrocarbons?

Burning hydrogen with pure oxygen produces only water vapor.
For example, LH2 and O2 rocket engines such as the Shuttle's.

Burning hydrogen with 'air' also produces other compounds,
including nitrous oxides (smog, harmful to humans). 'Air' is
not pure oxygen.

Check your chemistry.

Brian
--
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