PPSC Past Paper Sub Inspector Cooperative Societies 2018 Solved MCQs, Everyday Science MCQs, PPSC Solved Past Papers MCQsWhich of the following units is ozone layer thickness expressed in? Posted on June 7, 2021 by Rana TahirA. Joule B. Metro C. Dobson D. PoundShare this:Click to share on Twitter (Opens in new window)Click to share on Facebook (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Pinterest (Opens in new window)Click to share on LinkedIn (Opens in new window)