ppbv

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1. {{lb|en|sciences}} [[ppb|parts per billion]] by [[volume]]<ref>[https://projects.iq.harvard.edu/files/acmg/files/intro_atmo_chem_bookchap1.pdf] CHAPTER 1. MEASURES OF ATMOSPHERIC COMPOSITION] ([https://web.archive.org/web/20191010014735/http://acmg.seas.harvard.edu/people/faculty/djj/book/ Introduction to Atmospheric Chemistry, by Daniel J. Jacob, Princeton University Press, 1999.])</ref>

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