Details of CF3 Plume Plotter

This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the CF3 version of Plume Plotter.

Stacks and buildings

Building measurements are taken from [1]. The image below shows the layout of the stacks and buildings modelled. North is at the top; colours and numbers indicate the height 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]:

Emissions

The emission rates of pollutants (for each stack) were taken from [1], and are listed below:

PollutantEmission rate
per second
Oxides of nitrogen3.762 g
Sulphur dioxide940 mg
Carbon monoxide1.567 g
Particulates157 mg
VOCs313 mg
Hydrogen chloride188 mg
Hydrogen flouride31 mg
Cadmium and thallium627 μg
Mercury627 μg
Other metals9.4 mg
Dioxins and furans1.25 ng

Background levels

The background levels of pollutants are taken from [1], but only particulates and NOx are mentioned. The background levels of other pollutants are taken from the air quality assessment for the nearby incinerator (https://plumeplotter.com/cardiff/howitworks.php).

PollutantBackground
concentration per m3
Oxides of nitrogen12.2 μg
Sulphur dioxide2.9 μg
Carbon monoxide354 μg
Particulates11.7 μg
VOCs490 ng
Hydrogen chloride260 ng
Hydrogen flouride3.5 μg
Cadmium and thallium230 pg
Mercury2.3 ng
Other metals41.92 ng
Dioxins and furansN/A

Weather data

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

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

References

1. ENVIRONMENTAL STATEMENT PROPOSED APPLICATION - Proposed Mor Hafren Energy Recovery Facility. GP Planning Ltd. June 2020.