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Horsham Plume Plotter

The Horsham plume plotter shows a prediction of the current amount of air pollution (at ground level) caused by emissions from the proposed incinerator at North Horsham.

Plume Plotter predicts this fallout using AERMOD, which is one of the most widely used modelling systems for air pollution. It uses the latest local weather conditions and upper air data, which are obtained in real time.

Since the incinerator does not yet exist, Plume Plotter does not use real-time information about its emissions. Instead, it assumes that the incinerator is operating continuously (8760 hours per year) and emitting pollutants at a constant rate.

The emission rates assumed are the long-term planned emission rates that were specified by the incinerator developers in their planning application; the other parameters (e.g. emission velocity and temperature) used are also taken directly from the planning application.

Plume Plotter’s model takes account of the real terrain in the vicinity of the incinerator and the shape of the incinerator buildings.

The red line shows wind direction. Green rings show distance (km). Colours show concentration of oxides of nitrogen at ground level.


Animation of proposed Horsham incinerator 2016 plume, showing total amount of oxides of nitrogen reaching ground level, based on the latest (2018) version of the incinerator’s specification, using 2016 weather data from Gatwick Airport, assuming maximum incinerator emission rates.

Ni4H Campaign Video 2018

Video from the Ni4H April 2018 campaign against the planning application.

Click on the volume slider on the lower right side to unmute and adjust the volume.


News Story on ITV 2017