Derbyshire Fire & Rescue Service is still tackling the blaze at a recycling facility in Stanton by Dale, Derbyshire.
"We are currently working with Derbyshire Emergency Planning, the Environmental Health Agency and Nottinghamshire Fire and Rescue Service to ensure the safety of the local community. If you are concerned about your health due to the effects of the smoke, please seek medical attention."
The Fire Service is warning of continuing delays in the coming days, with possible road closures causing disruption.
Fire crews have spent a fourth night tackling a blaze at a woodyard in Stanton-by-Dale, Derbyshire.
Fire Fighters continue to fight a fire that started at a recycling plant on Lows Lane in Stanton-by-Dale in Derbyshire.
7000 tonnes of wood have been burning at the site of the Old Iron Works in Stanton since around 10.00 last night (15 September).