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    Question about PPBV

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    • S
      simonl last edited by simonl

      Hello,

      Sorry if this is the wrong place but I want to understand something :

      Windy says "CO concentration: Carbon monoxide is a colorless, odorless, and tasteless gas that is slightly less dense than air. The level of CO concentration in the troposphere is measured by a system called Parts Per Billion by Volume (PPBV)."

      I've found some different thresholds on the web in microgram per cubic meters

      I wanted to check, in my city how much we were about some dangerous thresholds.

      My city was at 173 PPBV but I had some troubles converting these 173 PPBV in mg / m3

      And I found that 1 PPBV = 1 mg / m3

      So that means 173 PPBV = 173 mg / m3

      But thresholds say :
      10 mg·m-3, for 8 h
      30 mg·m-3, for 1 h
      60 mg·m-3, for 30 min
      100 mg·m-3, for 15 min

      So 173 PPBV = 173 mg / m3 is much above the thresholds. Something is wrong with my result. Anyone could help about that? I may have missed something...

      idefix37 1 Reply Last reply Reply Quote 0
      • idefix37
        idefix37 Sailor Moderator @simonl last edited by idefix37

        @simonl
        For Carbon monoxide (CO)
        1 ppbv = 1.145 μg/m3

        According to this source: https://www2.dmu.dk/AtmosphericEnvironment/Expost/database/docs/PPM_conversion.pdf

        1 mg = 1000 μg

        So when you say « And I found that 1 PPBV = 1 mg / m3 », you have mixed milligrams and micrograms.

        173 ppbv =173 x 1.145 μg/m3 = 198 μg/m3 = 0.198 mg/m3

        So it’s approximately 0.2 mg/m3... fortunately for you otherwise you would be dead !

        1 Reply Last reply Reply Quote 1
        • S
          simonl last edited by

          @idefix37 said in Question about PPBV:

          @simonl
          For Carbon monoxide (CO)
          1 ppbv = 1.145 μg/m3
          According to this source: https://www2.dmu.dk/AtmosphericEnvironment/Expost/database/docs/PPM_conversion.pdf
          1 mg = 1000 μg
          So when you say « And I found that 1 PPBV = 1 mg / m3 », you have mixed milligrams and micrograms.
          173 ppbv =173 x 1.145 μg/m3 = 198 μg/m3 = 0.198 mg/m3
          So it’s approximately 0.2 mg/m3... fortunately for you otherwise you would be dead !

          Thank you!

          1 Reply Last reply Reply Quote 0
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