Traffic NO2 Overlay
Revision as of 12:03, 13 June 2018 by Daniel2@tygron.com (talk | contribs)
What is the Traffic NO2 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