how can ozone layer be formed in a reducing atmisphere ncert says so, quoting lines here: The uv - Biology - Evolution

Question

how can ozone layer be formed in a reducing atmisphere??
ncert says so, quoting lines here:
The uv from the sun brokeup water into hydrogen and oxygen and
the lighter lighter H2 escaped Oxygen combined with ammonia and
methane to form water,CO2 and others the ozone layer was formed

Mushtaq Ahmed · Accepted Answer

In the reducing atmosphere, oxygen (O2)
absorbs the UV radiation and breaks down to form nascent oxygen (O)
The nascent oxygen (O) reacts with oxygen molecule (O2)
and forms ozone
The reaction is as follows :
<img alt="" src=
"https://s3mn%20mnimgs%20com/img/shared/discuss_editlive/3950778/2013_11_20_22_56_39/ozone%20jpg">

how can ozone layer be formed in a reducing atmisphere?? ncert says so, quoting lines here: The uv from the sun brokeup water into hydrogen and oxygen and the lighter lighter H2 escaped.Oxygen combined with ammonia and methane to form water,CO2 and others.the ozone layer was formed.

how can ozone layer be formed in a reducing atmisphere??

ncert says so, quoting lines here:

The uv from the sun brokeup water into hydrogen and oxygen and the lighter lighter H2 escaped.Oxygen combined with ammonia and methane to form water,CO2 and others.the ozone layer was formed.