1. 
   ppbv
   acronym: parts per billion (109) by volume
   Found op http://cdiac.ornl.gov/pns/acronyms.html#P
   
   
2. 
   Ppbv
   Cover of Star Riders http://www.geocities.com/TimesSquare/Arena/2448/about.html ...
   Found op http://en.wikipedia.org/wiki/Ppbv
   
   
3. 
   ppbv
   1) Parts per billion by volume
   Found op http://www.mijnwoordenboek.nl/EN/crossword-dictionary/ppbv/1
   
   

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