The sun is seen after dawn near Exeter Oct. 16. 2017. Photograph: Toby Melville/Reuters

Copernicus Atmosphere Monitoring Service dust aerosol optical depth at 550 mm forecast for this morning, showing dust over Europe.

Millions of people all over the BeNeLux, northern Germany, parts of Denmark, Sweden, Poland and Baltic states saw the morning sum dimmed and/reddened by thick smoke from fires in north Spain and Portugal today. According to SevereWeatherEurope, this phenomena affecting even the UK, was due to wildfire smoke from Spain and Portugal  BeNeLux, north Germany, parts of Denmark, Sweden, Poland and Baltic states under thick smoke from fires in north Spain and Portugal today

Most other sources attribute the eery red hue of the sky over the UK, especially London, to Sahara dust being transported by Hurricane Ophelia, which had reached the Irish Coast yesterday. This dust was apparently also responsible for the reddish hue of the sky as far east as Hamburg. The coincidence of the two events and the general confusion of metrologists to distinguish the two are noteworthy.

Radio  Hamburg titled:  Rare phenomenon, Shara dust colors Hamburg Skies.