Rural fire crews were called to monitor a controlled burn-off spewing smoke across State Highway 3 on Thursday.
Fire services were notified around 2pm of a fire in Kai Iwi, where the smoke was a hazard for drivers.
Deputy principal rural fire officer Gavin Pryce said the fire itself didn't pose a threat, it was the large amount of smoke it was producing and its impact on nearby roads.
"It was a controlled burn-off," Pryce said.