This page should be read in conjunction with How Plume Plotter Works. It provides more details specific to the Plymouth version of Plume Plotter.
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 of two types. Both are calculated using the flow rate reported in [1], which is multiplied by the emission concentrations.
For the planned emission rates, the concentrations used are the IED limits, as stated in (e.g.) [1]. Resulting (mass per second) emission rates are listed below:
Pollutant | Emission rate per second |
---|---|
Oxides of nitrogen | 11.2 g |
Particulates PM10 | 559 mg |
Sulphur dioxide | 2.79 g |
TOC | 559 mg |
Carbon monoxide | 2.79 g |
Hydrogen chloride | 559 mg |
Hydrogen flouride | 55.9 mg |
Ammonia | 559 mg |
Cadmium and thallium | 2.79 mg |
Mercury | 2.79 mg |
Arsenic | 170 μg |
Chromium | 1.84 mg |
Nickel | 7.6 mg |
Other metals | 27.9 mg |
Dioxins and furans | 5.01 ng |
PAH | 501 μg |
PCBs | 279 μg |
The actual emission rates use the same flow rates and the annual average concentrations for 2020, as reported in the incinerator's annual report. They are listed below:
Pollutant | Emission rate per second |
---|---|
Oxides of nitrogen | 9.512 g |
Particulates PM10 | 5.992 mg |
Sulphur dioxide | 883 mg |
TOC | 21.84 mg |
Carbon monoxide | 249 mg |
Hydrogen chloride | 537 mg |
Hydrogen flouride | 10.36 mg |
Ammonia | N/A |
Cadmium and thallium | 48.44 μg |
Mercury | 165.2 μg |
Arsenic | N/A |
Chromium | N/A |
Nickel | N/A |
Other metals | N/A |
Dioxins and furans | 173.6 pg |
PAH | N/A |
PCBs | N/A |
The background levels of pollutants are taken from [1]:
Pollutant | Background concentration per m3 |
---|---|
Oxides of nitrogen | 15.3 μg |
Particulates PM10 | 13.3 μg |
Sulphur dioxide | 7.1 μg |
TOC | 330 ng |
Carbon monoxide | 134 μg |
Hydrogen chloride | 410 ng |
Hydrogen flouride | 3 ng |
Ammonia | 1 μg |
Cadmium and thallium | 90 pg |
Mercury | 10 pg |
Arsenic | 410 pg |
Chromium | 520 pg |
Nickel | 1.96 ng |
Other metals | 10.68 ng |
Dioxins and furans | 8.5 fg |
PAH | 121 pg |
PCBs | 1.724 ng |
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 and the secondary weather station is .
Upper air data is the latest reported by the Camborne upper air station.