Drone footage of the aftermath of the Tianjin explosions have been broadcast on China's state television channel, CCTV.
The footage shows the devastation caused by the blasts on Wednesday night, with burnt out buildings and cars surrounding the port.
China will launch a nationwide inspection of dangerous chemicals and explosives, the government said on Friday.
They say they must learn a "profound" lesson from two huge blasts at a warehouse in the northeast city of Tianjin that killed at least 50 people.
The State Council, China's cabinet, said in a statement posted to its website that it would crack down on illegal activities to strengthen industry safety.
Rescuers have pulled a firefighter trapped for 32 hours from the wreckage after responding to the massive explosions in Tianjin.
The fireman was rescued just after dawn and taken to hospital to be treated for face, chest and foot injuries, according to a state broadcaster.
The death toll so far includes 17 firefighters sent in after the first blast, with an unknown number of firefighters still missing in the area.
"Forces from all sides are searching for the (remaining) missing firefighters," Tianjin Fire Department head Zhou Tian said.
Meanwhile authorities are still dealing cautiously with a fire still smouldering amid potentially dangerous chemicals.
Water sprayed on chemicals by firefighters could have caused the deadly Tianjin explosions, experts said on Friday.
Firefighters were at the scene when the explosions took place after being called to reports of a container fire.
Police said the warehouse was storing chemicals including calcium carbide, which experts told the Reuters news agency reacts with water to create acetylene, a highly explosive gas.
Officials defended the actions of firefighters, saying they had not known the exact location of the calcium carbide.
A survivor was pulled from the wreckage on Friday, but 18 firefighters remained missing.
Nuclear and biochemical experts have been sent to Tianjin after at least 50 people were killed in two huge explosions in the northern Chinese city.
State media reported that a team from the International Atomic Energy Agency's Beijing environmental emergency response centre had been dispatched to the scene.
In addition, 214 Chinese military nuclear and biochemical materials specialists have gone to the port city as investigations continue into the blasts in an industrial area.
Police in Tianjin, China, have reportedly said they are unsure what toxins and chemicals may have been released in yesterday's warehouse explosions.
According to NBC Correspondent Ian Williams the fact that officials are unsure what was in the warehouses when the explosions happened is making the task of firefighters harder as it is unclear what is still fuelling the fire.
Survivors of the explosions in China which killed at least 50, and injured more than 700, have spoken of the moment they were caught up in the blasts.
One survivor, a security guard at the Tianjin warehouse site where the blasts originated, told ITV News how his quick thinking had saved his life.
He said: "Suddenly I heard the explosion and I lay down straight away but I still got injured. The security booth was completely destroyed."
ITV News Correspondent Rebecca Barry reports:
Satellite imagery has been released today showing the view from above, just moments before and after, the site of a series of explosions in the Chinese city of Tianjin.
In the first image the warehouse district where the blasts happened looks calm but moments later thick black smoke can be seen rising from the tops of what looks like buildings below.
Drone footage from above the site of yesterday's China explosions has shown the scale of damage caused by two blasts in the city of Tianjin's warehouse district.
In the footage, posted on the El Regional newspaper's YouTube channel, fires can be seen burning in the midst of burnt out buildings and explosion wreckage as black smoke billows into the sky.
Fires are reportedly still burning in the aftermath of a series of explosions in China's Tianjin tonight - more than 24 hours after the blasts shook the city.
The country's Xinhua News Agency reported that emergency rescue services were racing against the clock to contain fires in the warehouse district of the city and to find any remaining survivors.