Crews from across counties have been tackling the fire at a tyre and scrap depot in Ranskill through the night.
Update 12:00 Saturday 6 August
Nottinghamshire Police have launched an appeal for information after they suspect the fire was started deliberately.
Anyone with information about the incident is asked to call Nottinghamshire Police on 101, quoting incident number 240 of 5 August, or Crimestoppers anonymously on 0800 555 111.
Crews from across the county have been fighting the fire at Ranskill overnight and will continue to do so throughout the weekend.
We would like to thank our neighbouring fire services (Derbyshire, South Yorkshire, and Lincolnshire) for their support during this incident as well as our Police, EMAS and Environment Agency colleagues. We would also like to thank local businesses and the community for their patience and understanding for the disruption of the fire has caused.
Local road closures remain in place, and we ask people to avoid the area if possible.
If affected by the smoke please stay indoors and keep windows and doors closed.