Structural engineers are to check the stability of buildings which were damaged in a major fire at a recycling plant on the Leyland Trading Estate in Wellingborough.
Last week more than 60 firefighters were called to the blaze.
Northamptonshire Fire and Rescue Service monitored the site over the weekend and crews are still attending every four to six hours to conduct after fire inspections and to monitor the remaining hot spots and structure.
The area around the fire has now re-opened and experts say there is now a minimal risk for residents from the smoke and therefore the advice to close doors and windows and stay indoors has been relaxed
More than sixty firefighters have spent much of the day dealing with a large blaze at a recycling plant in Northamptonshire.
The fire at the Leyland Industrial Estate in Wellingborough started at around 8 o'clock this morning.
People living nearby were told to keep their windows and doors shut.
Click below to watch a report from ITV News Anglia's Olivia Paterson
14 fire engines and 60 firefighters are still trying to bring a major fire under control at a recycling plant in Wellingborough.
Police are warning people to stay indoors and several roads have been closed.
Several roads have been closed as a result of a major fire at a recycling plant in Wellingborough.
Northamptonshire Police are assisting firefighters to bring the blaze under control at the Leyland Industrial Estate.
The Senwick Road junction with Irthlingborough Road is closed to all traffic in the direction of Irthlingborough and the Leyland Trading Estate.
The Sidegate Lane junction with Irthlingborough Road is also closed to all traffic in the direction of Wellingborough.
Police also say that those living near the fire should keep their windows and doors closed.
Leyland industrial estate, Wellingborough closed folks due to a fire at a unit. http://t.co/07X9fkXDQb
Substantial fire at Leyland industrial estate, Wellingborough. Avoid the area folks. 12 fire engines in attendance.