Details of Swansea Plume Plotter

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

Stacks and buildings

Building measurements are taken from the building plans. This image shows the layout of the stack 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. None of these are specified in [1]:

Emissions

The emission rates of pollutants are taken from [1]:

PollutantEmission rate
per second
Oxides of nitrogen1.387 g
Particulates69 mg
Sulphur dioxide347 mg
Carbon monoxide347 mg
Hydrogen chloride 69 mg
Hydrogen fluoride 6.93 mg
VOCs69 mg
Cadmium and thallium350 μg
Mercury350 μg
Other metals3.47 mg
Dioxins and furans693.3 pg
PAHs119.5 ng
PCBs63.79 pg

Background levels

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

PollutantBackground
concentration per m3
Oxides of nitrogen12.64 μg
Particulates12.73 μg
Sulphur dioxide3.33 μg
Carbon monoxide112 μg
Hydrogen chloride 212 ng
Hydrogen fluoride N/A
VOCs450 ng
Cadmium and thallium320 pg
Mercury3.5 ng
Other metals70.98 ng
Dioxins and furansN/A
PAHs400 pg
PCBsN/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. Proposed Small Scale Energy Recovery Facility On Land at Swansea Depot, Clarion Close, Morriston, Swansea -- Air Quality Assessment. WYG. December 2018.