Hirwaun Plume Plotter
Hirwaun incinerator plume
at 10:20 on Thu, 15 Jan 2026
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The map shows the predicted pollution caused by the emissions from the proposed incinerator at Fifth Avenue, Hirwaun Industrial Estate.

The red line shows wind direction. Green rings show distance (km). Colours show concentration of oxides of nitrogen at ground level. Maximum: 125 ng/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
Sulphur dioxide
Carbon monoxide
Particulates
TOC
Hydrogen chloride
Cadmium and Thallium
Mercury
Other metals
Ammonia
Dioxins and furans
PCBs
PAHs

Oxides of nitrogen
Sulphur dioxide
Carbon monoxide
Particulates
TOC
Hydrogen chloride
Cadmium and Thallium
Mercury
Other metals
Ammonia
Dioxins and furans
PCBs
PAHs

Concentration
per m3
Background
(annual mean)
Plume
Oxides of nitrogen6.16 µg125 ng(2%)
Sulphur dioxide2.79 µg31.3 ng(1%)
Carbon monoxide97.9 ng156 ng(160%)
Particulates10.3 µg15.6 ng(0%)
TOC162 ng31.3 ng(19%)
Hydrogen chloride185 ng15.6 ng(8%)
Hydrogen flourideN/A3.13 ng
Cadmium and Thallium285 pg62.6 pg(22%)
Mercury21.7 pg62.6 pg(289%)
Other metals25 ng938 pg(4%)
Ammonia1.24 µg1.56 ng(0%)
Dioxins and furans4.58 fg0.125 fg(3%)
PCBs22.2 pg0.187 fg(0%)
PAHs252 pg3.13 pg(1%)
Display parameters
Zoom:
+
Area:
Centred
Downwind
Emissions:
Planned
Latest weather data
Wind 4.7 mph (2.1 m/s) from 120°. Cloud cover: 10/10. Temp: 7°C. Pressure: 1000 mb. Data from Cardiff airport at 10:20.