The area affected by the smoke and dust stretches over 1,000 miles (1,600 kilometers).
The reddish tint was a side effect of the remnants of Hurricane Ophelia and the wildfires that have been raging across Portugal and northwest Spain since Friday.
Smoke and debris from the fires — along with sand from the Sahara desert — are being carried north by the storm’s strong winds. Particles of smoke, dust and sand bend light to give it a reddish hue.
A red-hued sun has been seen before in the UK, but it’s this combination of events that has made Tuesday’s phenomenon particularly striking.
The trail of smoke spans over 1,000 miles (1,600 kilometers). The health risks are minimal in the UK as the smoke is mostly limited to higher altitudes in the atmosphere.
With the wind expected to change by Tuesday, the air is likely to clear.
Social media users have taken to Twitter and Instagram to document the strange phenomenon.
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