This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Limerick version of Plume Plotter.
There are several emissions sources, but we currently only model the largest two ("Kiln 6" and "Coal Mill 6"). The measurements of both of these, taken from , are:
Albedo, Bowen ratio, and roughness length are not specified in  but we use the following values:
The emission rates of pollutants are taken from Table 8.5 of . The table below shows the emission rates from Kiln 6; the rates for Coal Mill 6 are 0.07 times the rates for Kiln 6:
|Oxides of nitrogen||69.4 g|
|Sulphur dioxide||6.9 g|
|Particulates PM10||2.8 g|
|Hydrogen chloride||1.4 g|
|Hydrogen flouride||140 mg|
|Dioxins and furans||14 ng|
The background levels of pollutants are taken from the Tables 8.6 and 8.7 of . For pollutants that appear in both tables (lead, arsenic, cadmium, nickel, and mercury), the lowest background concentration is used. The values used are:
concentration per m3
|Oxides of nitrogen||4.6 μg|
|Sulphur dioxide||3.3 μg|
|Particulates PM10||19.1 μg|
|Hydrogen chloride||970 ng|
|Hydrogen flouride||15.5 ng|
|Dioxins and furans||6 fg|
For consistency with other incinerators, the background concentration of nitrogen oxides shown here is actually the background concentration of nitrogen dioxide only.
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 IHRABSTW2 and the secondary weather station is ICOLIMER2.
Upper air data is the latest reported by the Valentia upper air station.
1. Irish Cement Limited. Use of alternative fuels and alternative raw materials at Limerick Cement Works: Environmental Impact Statement. April 2016. Chapter 8: Air quality.