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Polybrominated diphenyl ethers, or PBDEs, are fire-retardant chemicals that are found everywhere -- upholstery, carpets, curtains, electronics, and even infant products.

In the mid-2000s, one class of chemicals, polybrominated diphenyl ether flame retardants, were gradually phased out of use due to concerns about their potential toxicity.

The research found the levels of banned PBDEs, or polybrominated diphenyl ethers, in breast milk have declined some 70% over the past two decades.

The plant was expected to take in shipments of methylene diphenyl diisocyanate, or MDI, from China.

Flame retardant chemicals, short-chain chlorinated paraffins and polybrominated diphenyl ethers disrupt endocrine function and negatively affect reproductive health.