The blaze started about 1.10pm Tuesday, sending clouds of black smoke billowing across the CBD.
Firefighters battle the blaze at the SkyCity Convention Centre in downtown Auckland.
Auckland Regional Public Health Service advised people to stay out of the city if they could, close the windows and turn off external ventilation to their homes.
Fire and Emergency said on Wednesday it expected to be on site for about 24 hours more.
SkyCity boss Graeme Sinclair and Fletcher Building chief executive Ross Taylor address mediaMore than 100 firefighters and an aerial appliance at the scene of the SkyCity Auckland Convention Centre fire.Firefighters up on cherry pickers at the scene.Water arcs through the air as firefighters battle the blaze.Roads are closed in the CBD and buses are diverted for a second day.Fire crews battle the blaze at Auckland's SkyCity Convention Centre for a second day.Many people on the street are wearing masks as the smoke hangs in the air.Fresh firefighters were rostered on on Wednesday as the personnel who had battled the flames overnight were 'exhausted', Fire and Emergency NZ said.Ron Devlin from Fire and Emergency NZ talks to media at the scene.Flames could still be seen on the roof on Wednesday.Firefighters gather near the SkyCity Convention Centre.Firefighters carry breathing apparatuses as they walk near the site of the fire.Auckland Mayor Phil Goff watches the firefighters' progress from his office window.Plumes of smoke fill the air on Wednesday, 24 hours after the fire broke out.Firefighters meet at a rally point near the blaze.Firefighters guide a hose onto the flames.Orange flames leap from the roof on day two of the fire.A haze hangs over the CBD on Wednesday.Prime Minister Jacinda Ardern and Auckland Mayor Phil Goff meet with firefighters and officials.A fireman takes the fight to the fire at the SkyCity Convention Centre building site after 24 hours of battling the blaze.The prime minister greets firefighters at the cordon.View of the SkyCity Convention Centre blaze from Victoria Street.Prime Minister Jacinda Arderrn hailed the firefighters for their professionalism.A firefighter operates a board detailing the location of personnel at the convention centre.Firefighters take a break outside the SkyCity Convention Centre.A person wears an air mask near the SkyCity Convention Centre.Firefighters aboard a cherry picker.Firefighters take a break.A firefighter takes a deep breath of fresh air after removing his breathing apparatus.Firefighters using breathing apparatus and soaked with water leave the site on Wednesday.People are being warned to stay out of the CBD if they can.A firefighter climbs a ladder as the battle against the flames continues.Water hits the convention centre from multiple angles as firefighters continue their assault.
