Details of Horsham Plume Plotter

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

Stacks and buildings

Building measurements are taken from [1]. This image shows the layout of the stack and buildings modelled. North is at the top; colours and numbers indicate the heights of the buildings and the stack:

Stack measurements

All of 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 taken from [1]. These are:

PollutantEmission rate
per second
Oxides of nitrogen9.7 g
Sulphur dioxide2.4 g
Carbon monoxide2.4 g
Particulates500 mg
Hydrogen chloride500 mg
Hydrogen flouride50 mg
Cadmium and thallium2 mg
Mercury2 mg
Other metals24 mg
Benzo(a)pyrene480 μg
Dioxins and furans4.8 ng
PCBs240 μg

Background levels

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

concentration per m3
Oxides of nitrogen11.9 μg
Sulphur dioxide1.57 μg
Carbon monoxide250 μg
Particulates24 μg
Hydrogen chloride390 ng
Hydrogen flouride2.46 μg
Cadmium and thallium250 pg
Mercury2.47 ng
Other metals39.75 ng
Benzo(a)pyrene230 pg
Dioxins and furans26.7 fg
PCBs64.4 pg

Weather data

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

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


1. Wealden Recycling, Recovery and Renewable Energy Facility: Environmental Statement, Volume 1. Chapter 7: Air Quality and Odour. RPS. March 2018. Filename "Vol 1 Chpt 7 Air Quality and Odour.pdf"