Details of Harlingen Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Harlingen version of Plume Plotter.

Stacks and buildings

Building measurements are taken from drawings in the planning application [1] and from aerial photos. This image shows the layout of the stack and building modelled. North is at the top; colours and numbers indicate the height of the building and the stack:

Stack measurements

These are taken from [1]:

The following values are used for albedo, Bowen ratio and roughness length. Roughness length is as specified in [1]:


The emission rates of pollutants are of two types. Both are calculated by multiplying the flow rate by the emission concentration.

For the planned emission rates, the concentrations used are the limits stated in [1]. Resulting (mass per second) emission rates are listed below:

PollutantEmission rate
per second
Oxides of nitrogen2.95 g
Particulates73.75 mg
Sulphur dioxide491.7 mg
Carbon monoxide1.475 g
Hydrogen chloride245.8 mg
Hydrogen flouride9.833 mg
TOC245.8 mg
Ammonia147.5 mg
Mercury245.8 μg
Cadmium and thallium98.33 μg
Other metals2.458 mg
Dioxins and furans491.7 pg

The actual emission rates are calculated from the annual average concentrations and flow rate for 2015, as reported in [2]. They are listed below:

PollutantEmission rate
per second
Oxides of nitrogen3.403 g
Particulates14.35 mg
Sulphur dioxide203.8 mg
Carbon monoxide211 mg
Hydrogen chloride434.6 mg
Hydrogen flouride11.95 mg
TOC2.989 mg
Ammonia53.8 mg
Mercury179 μg
Cadmium and thallium1.2 mg
Other metals5.98 mg
Dioxins and furans598 pg

Background levels

The background levels of pollutants are taken from [1]. These are:

concentration per m3
Oxides of nitrogen12.4 μg
Particulates15.4 μg
Sulphur dioxide1 μg
Carbon monoxide214.5 μg
Hydrogen chloride810 ng
Hydrogen flouride40 ng
TOC540 ng
Mercury3 ng
Cadmium and thallium160 pg
Other metalsN/A
Dioxins and furansN/A

Weather data

Weather data is taken from METAR reports from a local airport: Leeuwarden.

Upper air data is the latest reported by the Nordeney upper air station.



2. MER-evaluatie REC Harlingen: Gegevensinventarisatie en -evaluatie. LievenseCSO. June 2017.