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tubes
  • Created 2 years ago

    Diffusion Tube Data

    Calderdale Council
    Diffusion tubes are small, relatively inexpensive air pollution (nitrogen dioxide) monitors.  They are small plastic tubes, open at one end with a gauze at the other end.  The gauze is soaked in a chemical that captures the pollution and lets us work out the average amount of pollution in the air. This data has all of the monthly pollution levels measured in Calderdale using diffusion tubes since 1993.  The older measurements (1993-200...