Details of Halton Plume Plotter

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

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 nitrogen40 g
Particulates PM102 g
VOCs2 g
Hydrogen chloride2 g
Hydrogen flouride200 mg
Carbon monoxide10 g
Sulphur dioxide10 g
Mercury10 mg
Cadmium and thallium10 mg
Other metals100 mg
Dioxins and furans20 ng

Background levels

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

concentration per m3
Oxides of nitrogen26 μg
Particulates PM1025.6 μg
Hydrogen chloride550 ng
Hydrogen flouride2.46 μg
Carbon monoxide240 μg
Sulphur dioxide20 μg
Mercury2 ng
Cadmium and thallium300 pg
Other metals34.48 ng
Dioxins and furans86 fg

Weather data

Wind speed, wind direction, temperature, pressure, and solar radiation are the latest values reported by one of two weather stations. If a value is not available from the primary weather station it is obtained from the secondary weather station. (Some weather stations do not measure solar radiation at all.) The primary weather station is IUKBEBIN1 and the secondary weather station is IBIRKENH28.

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


1. Runcorn Energy from Waste Project: Environmental Statement. Appendix 10.1 - Air Quality Assessment. December 2006. There is no direct link! Search for planning application 07/00068/ELC here