High air pollution alerts have been issued for Bergen, Trondheim, and Stavanger due to increased levels of particulate matter, posing health risks especially to vulnerable groups.

Milton grew quickly into a Category 5 storm Monday morning and is forecast to make landfall in Florida midweek.

The smoke particles have already reached high into the atmosphere, so they won't cause health problems or unusual odours. The most colourful sunset is expected on Tuesday evening.