Fire crews tackled a blaze at an industrial plant in Jebel Ali on Monday that sent black smoke billowing over the area.
Dubai Media Office said the plant in the Jebel Ali freezone extension district processes waste oil.
Firefighters were at the scene and images showed them spraying foam onto the flames.
"The accident is under control and there are no injuries," Dubai Civil Defence said in a statement shortly after midday.
A later statement from the government media office said: "Civil Defence teams have brought under control a fire that broke out at an oil waste disposal site in the Jebel Ali Industrial Area, located far from factories in the zone.
"The site saw heavy smoke due to the burning of oil waste. No casualties have been reported."
Smoke could be seen in the skies over the nearby Expo 2020 Dubai site, but it had largely dispersed within an hour.