Portskewett Plume Plotter
Portskewett incinerator plume
at 07:50 on Tue, 24 Jun 2025
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The map shows the (predicted) current state of pollution from the proposed incinerator at Severn Bridge Industrial Estate, Caldicot.

The red line shows wind direction. Green rings show distance (km). Colours show concentration of oxides of nitrogen at ground level. Maximum: 59.9 µg/m3. This is the concentration at the location that is most polluted by the plume.

Breakdown of pollutants at most polluted location (green = background, red = added by plume):

Oxides of nitrogen
Particulates
TOC
Hydrogen chloride
Sulphur dioxide
Carbon monoxide
Cadmium and thallium
Mercury
Other metals
Dioxins and furans

Oxides of nitrogen
Particulates
TOC
Hydrogen chloride
Sulphur dioxide
Carbon monoxide
Cadmium and thallium
Mercury
Other metals
Dioxins and furans

Concentration
per m3
Background
(annual mean)
Plume
Oxides of nitrogen16.6 µg59.9 µg(362%)
Particulates13.6 µg3 µg(22%)
TOC198 ng3 µg(1513%)
Hydrogen chloride1.84 µg3 µg(163%)
Hydrogen flourideN/A300 ng
Sulphur dioxide3.98 µg15 µg(376%)
Carbon monoxide103 µg15 µg(15%)
Cadmium and thallium1.62 ng15 ng(926%)
Mercury5.27 ng15 ng(284%)
Other metals85.9 ng150 ng(174%)
Dioxins and furans48.7 fg30 fg(62%)
Display parameters
Zoom:
+
Area:
Centred
Downwind
Emissions:
Planned
Latest weather data
Wind 11.4 mph (5.1 m/s) from 220°. Cloud cover: 10/10. Temp: 14°C. Pressure: 1013 mb. Data from Bristol airport at 07:50.