Whangarei's Northport is operating again, after an ammonia leak caused an evacuation on Monday evening.
The Fire Service was called just after 5pm on Monday after the coolstore's ammonia alarms went off. The gas could also be smelt strongly.
The port was evacuated for almost two hours while firefighters used a ventilation fan to disperse the gas.
The Fire Service says the ammonia levels were not dangerously high, which made the dispersal easier.