Souvik Manna

Mmm.

At that altitude the concentration is ~10^11 molecules per cc.

https://www.chegg.com/homework-help/questions-and-answers/z-km-o3-profile-ozone-layer-stratosphere-piocewise-lincar-approximation-peak-number-concen-q33322032

I doubt that a COTS ozone sensor designed for use in 1 bar would be useful.

(at rtp there being 10^20 molecules per cc, give or take)

So a sensor would need to have 1ppb as its upper range, and have a resolution ten times better than that at least.

A spectral absorption method appears to be the best bet:

Article Miniature Personal Ozone Monitor Based on UV Absorbance

And you may need to 'fold' the optical path a few times to reduce the upper detection limit to the desired value. A Heriott or White cell may help.

The absorption of interest is in the 250nm range:

https://slideplayer.com/slide/16277008/

...and LEDs are available nowadays that can provide significant flux at those wavelengths - so no need to look at D2 or Xe lamps!

Ozone sensor measures the concentration of ozone present in air.

It is electro chemical sensor and ultra violet based.