Tianjin explosions: Big questions remain – CNN

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 Wednesday night at a chemical storage warehouse, 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 blasts — one of which was the equivalent of more than 20 tons of TNT exploding.

At least 56 people have died and more than 700 are injured, some critically. Many others remain unaccounted for.

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

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