Hirwaun Plume Plotter
Hirwaun incinerator plume
at 02:50 on Sat, 22 Mar 2025
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The map shows the (predicted) current state of pollution 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: 406 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 µg406 ng(7%)
Sulphur dioxide2.79 µg102 ng(4%)
Carbon monoxide97.9 ng508 ng(518%)
Particulates10.3 µg50.8 ng(0%)
TOC162 ng102 ng(63%)
Hydrogen chloride185 ng50.8 ng(27%)
Hydrogen flourideN/A10.2 ng
Cadmium and Thallium285 pg203 pg(71%)
Mercury21.7 pg203 pg(937%)
Other metals25 ng3.04 ng(12%)
Ammonia1.24 µg5.08 ng(0%)
Dioxins and furans4.58 fg0.406 fg(9%)
PCBs22.2 pg0.607 fg(0%)
PAHs252 pg10.2 pg(4%)
Display parameters
Zoom:
+
Area:
Centred
Downwind
Emissions:
Planned
Latest weather data
Wind 11.4 mph (5.1 m/s) from 110°. Cloud cover: 0/10. Temp: 9°C. Pressure: 997 mb. Data from Cardiff airport at 02:50.