Windy Community

    • Register
    • Login
    • Search
    • Unread
    • Categories
    • Groups
    • Go to windy.com

    Question about PPBV

    Your Feedback and Suggestions
    3
    5
    928
    Loading More Posts
    • Oldest to Newest
    • Newest to Oldest
    • Most Votes
    Reply
    • Reply as topic
    Log in to reply
    This topic has been deleted. Only users with topic management privileges can see it.
    • 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!

          D 1 Reply Last reply Reply Quote 0
          • D
            dinytch @simonl last edited by

            @simonl
            @idefix37
            Good afternoon! I am trying to understand what PPBV means when applied to the norms in my country. We have:
            rural areas - 332 ppm
            small towns - 409 ppm
            Big cities - 511 ppm.
            now in my city 500 ppbv, if you believe the map is a serious excess, вut how to convert PPBV to ppm?
            But when converted to ppm, it turns out that it is 0.5 ppm. Where is the error? Please help me to understand

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

              @dinytch

              ppm means part per million
              ppb means part per billion (and ppbv is just specifying by volume)
              1 ppm = 1000 ppb
              0.5 ppm = 500 ppb
              Generally for gases ppm is expressed in volume and your standards are probably in ppm by volume. But you must check it.

              1 Reply Last reply Reply Quote 0
              • First post
                Last post
              Windyty, S.E. - all rights reserved. Powered by excellent NodeBB
              NodeBB & contributors, OSM & contributors, HERE maps
              Terms of Use     Privacy Policy