Details of Cornwall Plume Plotter

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

Stack measurements

All of these are taken from [1]:

Emissions

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:

PollutantEmission rate
per second
Oxides of nitrogen5.81 g
Sulphur dioxide780 mg
Carbon monoxide1.94 g
Particulates PM10388 mg
Hydrogen chloride388 mg
Hydrogen flouride39 mg
VOCs388 mg
Ammonia190 mg
Mercury1.94 mg
Cadmium and thallium1.94 mg
Other metals19.4 mg
Dioxins and furans3.88 ng

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:

PollutantEmission rate
per second
Oxides of nitrogen5.167 g
Sulphur dioxide321.8 mg
Carbon monoxide312 mg
Particulates PM1023.28 mg
Hydrogen chloride226.4 mg
Hydrogen flouride11 mg
VOCs5.82 mg
Ammonia1.552 mg
Mercury90 μg
Cadmium and thallium43.65 μg
Other metals3.356 mg
Dioxins and furans55.68 pg

Background levels

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

PollutantBackground
concentration per m3
Oxides of nitrogen7.5 μg
Sulphur dioxide8.8 μg
Carbon monoxide96 μg
Particulates PM1023 μg
Hydrogen chloride1.7 μg
Hydrogen flouride1 μg
VOCsN/A
AmmoniaN/A
Mercury130 pg
Cadmium and thallium90 pg
Other metals49.74 ng
Dioxins and furans18.9 fg

Weather data

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.

References

1. Cornwall Energy Recovery Centre Planning Application ES Chapter 7: Air quality and climate. SITA Cornwall Limited.