DuPont Tragedy One of Many Toxic Gas Releases

*Correction appended

A Saturday morning tragedy introduced Texans to an invisible killer.

Methyl mercaptan, a foul-smelling gas, overwhelmed five workers at the DuPont chemical plant in La Porte on Nov. 15, killing four – including two brothers – and sending another to the hospital.

Such rapid deaths from toxic chemical exposure are rare, experts say.

But dozens of times in the past two years, a Texas Tribune analysis shows, plants across Texas have reported accidentally releasing gases that can be deadly in relatively small amounts.

Thousands – and even millions – of pounds of toxic chemicals beyond what permits allow have spewed from facilities ...

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