Continuous monitoring of nitrogen oxides concentrations in Stockholm started in the beginning of the eighties. Therefore it is not possible to compare the dispersion calculations with measured values in the sixties and seventies as for sulphur dioxide. The calibration between emission databases, dispersion calculations and measurements could be made for the eighties.

The dispersion calculation for the eighties in the figure above includes emissions of nitrogen oxides from road traffic and from heating. The grid resolution of the calculation in the window above is 500 meters times 500 meters.


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