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Examples
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As for the trace gas argument, not a perfect analogy, but think what CFCs (pptv) have done to the ozone layer (in the stratosphere) above Antarctica.
The Simplest Explanation EliRabett 2010
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Assuming these emissions have been sustained for 10 years and using the MWM lifetime of 740 years, yields an upper limit of the current mixing ratio of 0.10 pptv.
Archive 2008-07-01 EliRabett 2008
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The upper limit of atmospheric concentration of NF3 is estimated to be 0.10 pptv and its contribution to radiative forcing of climate change is negligible preceded by an reasonable estimate of what is happening
Archive 2008-07-01 EliRabett 2008
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IONICON PTR-MS technology is trusted by scientists all over the world with good reason and is known for a market-leading single-digit pptv-level detection limit for most VOCs.
PR.com Press Releases Ionicon Analytik GmbH 2009
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IONICON is the world's leading producer of on-line VOC detectors with market-leading, on-line and real-time, single-digit, pptv-level sensitivities using the unique proton transfer reaction - mass spectrometry technology.
PR.com Press Releases Ionicon Analytik GmbH 2009
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Police State 4 The Rise Of FEMA pptv Xvid/20100421_PoliceState4. part059.rar
Fulldls.com 2010
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Police State 4 The Rise Of FEMA pptv Xvid/20100421_PoliceState4. part055.rar
Fulldls.com 2010
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Police State 4 The Rise Of FEMA pptv Xvid/20100421_PoliceState4. part058.rar
Fulldls.com 2010
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Police State 4 The Rise Of FEMA pptv Xvid/20100421_PoliceState4. part060.rar
Fulldls.com 2010
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Police State 4 The Rise Of FEMA pptv Xvid/20100421_PoliceState4. part016.rar
Fulldls.com 2010
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