Windy Community
    • Unread
    • Categories
    • Groups
    • Go to windy.com
    • Register
    • Login

    Conversion to PPM

    Your Feedback and Suggestions
    3
    4
    2.1k
    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.
    • C
      CryHavoc Mariners - Seafarers
      last edited by

      I LOVE THIS SITE! But I have a question that I hope someone can help with. I was looking at the concentration of NO₂, SO₂ and PM2.5 and wanted to convert the reading into Parts Per Million (PPM). All the formulas I've found were for converting concentrations expressed in mass (in milligrams) per cubic meter (mg/m³); however the site is showing concentrations of Sulphur Dioxide per square meter (mg/m²), rather than per cubic meter. This doesn't make sense to me (meters squared vs meters cubed), and I believe is most likely an error, but this is far from my area of expertise, so I wanted to check and see if it is supposed to be mass per meter cubed (g/m³), or if mass per square meter is correct, what the formula would be to convert this reading to PPM? I found a conversion formula of Concentration (mg/m³) = 0.0409 X PPM X Molecular Weight.

      If anyone can help clarify I would appreciate it.

      idefix37I 1 Reply Last reply Reply Quote 1
      • idefix37I
        idefix37 Sailor Moderator @CryHavoc
        last edited by idefix37

        @CryHavoc
        In the app, I see SO2 concentration in μg/m3 from GEOS-5 data:

        FD114FB2-ED7E-46A2-AABE-D5663ADEE778.jpeg

        But on website it is mg/m2 from Copernicus data:

        Capture d’écran 2020-07-01 à 10.06.51.png

        It should be better to have the same data used both on website and in the app.

        Anyway the mg/m2 are probably an error as the Copernicus website shows SO2 amounts expressed in μg/m3.

        0C5EDDA0-5662-4214-900B-3C6B1BB5BD3E.jpeg

        idefix37I 1 Reply Last reply Reply Quote 0
        • idefix37I
          idefix37 Sailor Moderator @idefix37
          last edited by idefix37

          @CryHavoc
          EDIT
          SO2 data supplied by Copernicus are NOW corresponding to a column of this gas from ground to top of atmosphere and accordingly mg/m2 is the correct unit.
          https://community.windy.com/topic/12744/windy-presents-3-new-air-quality-layers
          @Korina
          Please, the description of SO2 layer in the FAQ should be changed :
          https://community.windy.com/topic/3361/description-of-weather-overlays

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

            @idefix37
            Good afternoon! I am trying to understand what CO in 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 believe the map this 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

            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