Details of Shepperton Gasifier Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Shepperton Gasifier 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 nitrogen928 mg
Sulphur dioxide464 mg
Particulates92.8 mg
Carbon monoxide464 mg
Hydrogen chloride92.8 mg
Hydrogen flouride9.28 mg
TOC92.8 mg
Ammonia92.8 mg
Cadmium and thallium464 μg
Mercury464 μg
Other metals4.64 mg
Benzo(a)pyrene928 ng
Dioxins and furans928 pg
PCBs46.4 μg

Background levels

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

concentration per m3
Oxides of nitrogen37.6 μg
Sulphur dioxide4.39 μg
Particulates24.1 μg
Carbon monoxide470 μg
Hydrogen chloride530 ng
Hydrogen flouride2.35 μg
TOC1.07 μg
Ammonia1.48 μg
Cadmium and thallium220 pg
Mercury2.02 ng
Other metals26.01 ng
Benzo(a)pyrene190 pg
Dioxins and furans27.82 fg
PCBs243.2 pg

Weather data

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

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


1. SITA CHARLTON LANE ECO PARK AIR QUALITY ASSESSMENT (4th Issue). Fichtner. September 2013.