PPSC Past Paper Assistant Labour and Human Resource 2019 Solved MCQs, General Knowledge MCQs, PPSC Solved Past Papers MCQswhich country has built the world largest Air Purifier to fight pollution? Posted on April 17, 2021 by Rana TahirA. America B. China C. Japan D. Green LandShare 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)