Details of Omagh Plume Plotter

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

Stacks and buildings

Building measurements are taken from [2]. This image shows the layout of the stack and building modelled. North is at the top; colours and numbers indicate the height of the building and the stack.

Stack measurements

These are taken from [1]:

Stack location: 54.545383,-7.3068639.
Stack height: 20 m.
Stack diameter: 0.55 m.
Stack gas exit velocity: 18 m/s.
Stack gas temperature: 180 °C.

The following values are used for site characteristics. Roughness length is as specified in [1]:

Albedo: 0.2.
Bowen ratio: 1.
Roughness length: 0.2.

Emissions

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

Pollutant	Emission rate per second
Oxides of nitrogen	540 mg
Carbon monoxide	130 mg
Particulates	30 mg
VOC	30 mg
Hydrogen chloride	30 mg

Background levels

Background levels of some pollutants are specified in [1]:

Pollutant	Background concentration per m³
Oxides of nitrogen	2.95 μg
Carbon monoxide	N/A
Particulates	6.51 μg
VOC	N/A
Hydrogen chloride	N/A

Weather data

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

Upper air data is the latest reported by the Castor Bay upper air station.

References

1. AIR QUALITY ASSESSMENT - OMAGH INCINERATOR. Irwin Carr Consulting. March 2023.

2. Plans, Maps and Drawings - Omagh Waste Energy Plant. 2018-2020.