About 300 kilo-grammes of synthesized ammonia leaked from a cracked pipe at Henan Zhonghong Coal Chemical Company yesterday.

A total of 154 residents who live nearby the accident site were sent to hospital. Forty-one remain under observation, whereas five are in serious conditions, a news agency reported today.

The government said the ammonia detected in the air near the site is within the national standard. Post accident, the plant operations have been suspended.

A number of incidents of workplace safety hazards have occurred in China. In August, a warehouse storing hazardous chemicals caught fire and exploded in the northern port city of Tianjin, killing 165 and leaving eight missing in China's worst industrial accident.

In 2013, a gas line ruptured in the eastern port city of Qingdao, triggering blasts that killed 62 people.



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