Brighton residents were urged to keep windows and doors shuts following a major fire last night.
Fire fighters left the scene this morning following a fire at a waste depot in Hollingdean Road at about 11pm.
Crews will return later in the day to reinspect but residents have been told they can open their doors and windows if they feels it is safe.
East Sussex Fire and Rescue Service sent six pumps to the fire and used jets, foam and an aerial ladder to tackle the blaze.
Posting on social media, a spokesman for East Sussex Fire and Rescue Service said: "At 22.53, 6 pumps were sent from Preston Circus, Hove, Roedean, Lewes & Newhaven to reports of a fire in Hollingdean Lane, Brighton.
"1 in 7 foam is being used to put the fire out. An update will be made in an hour. Please close windows and doors."
"01:00 #Brighton update. Please close your windows and doors due to the volume of smoke. Crews are using 3 jets, Foam, 3 hydrants, breathing apparatus and the Ariel ladder platform to bring the blaze under control.
"Update 02.15 #Brighton #Hollingdean three appliances will remain on scene throughout the night damping down. Residents are reminded to keep their windows and doors closed.
"08:30 #Brighton #Hollingdean steady progress is being made to remove materials and damp down. Crews are using two main jets and portable pump ventilation. Businesses and residents living nearby are being urged to keep their windows and doors closed."