Tianjin explosions: The big questions that still remain – CNN International

Tianjin, China (CNN)When the wind blows in this Chinese port city, shards of glass still rain down from damaged buildings.

But many here are now more worried about a potential threat they can’t see: pollution from the hazardous materials that ignited, sending a towering cloud of fire and smoke shooting into the sky.

“We are concerned that certain chemicals will continue to pose a risk to the residents of Tianjin,” the environmental group Greenpeace said. City residents shared similar fears on social media.

Despite reassurances from authorities, what might linger in the air or water is one of several big questions that remain unanswered in the aftermath of the Wednesday night disaster that erupted from a chemical storage warehouse.

The explosions, one of which was the equivalent of more than 20 tons of TNT, are already confirmed to have taken the lives of 50 people and injured more than 700. Many others remain unaccounted for.

Here are some of the big questions officials are yet to clearly answer:

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