Around 700 tonnes of highly toxic sodium cyanide were at the site in the northern port of Tianjin, officials say, and water could spread it more widely.
Rainwater could also disperse chemical residues on the ground into the air when it evaporates, and some of the many substances on the scene could react with it.
Amid public anger over the disaster more details about the site operator were reported and a senior work safety official was put under investigation.
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