Traffic NO2 Overlay

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What is the Traffic NO2 overlay?

Active Traffic NO2 air polution overlay

The Traffic NO2 overlay is an Overlay which displays the impact of traffic air polution (in μg/m³ nitrogen dioxide) in different colors for the project area. These colors indicate traffic air polution of a location based on traffic flow and distance.

Traffic NO2 air polution overlay colors

File:Traffic NO2-Overlay Legend.jpg
Traffic NO2 overlay colors

Calculations

The calculations follow the standard rekenmethode 1 (SRM 1), as described on [1]:

Cjm = Ca,jm + Cb,jm

where:

  • Cjm = yearly average concentration [μg/m3]
  • Ca,jm = yearly average background-concentration (default = 0 [μg/m3], can be adjusted via the overlay attributes)
  • Cb,jm = yearly average traffic contribution to NO2 concentration [μg/m3]


Cb,jm = Fk * E * θ * Fb * Fmeteo

where:

  • Fk = calibration factor [-] (default = 0.62)
  • E = Emission number, depending on traffic [μg/m/s]
  • θ = Delution factor [-] (default = XXX)
  • Fb = Treefactor [-]
  • Fmeteo = 5/windspeed. Default windspeed is 5 m/s

References

The overlay calculations are based on Standard Calculation Method 1 (SRM1) as defined by the dutch government: wetten.overheid.nl