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The EPA says the chemical's primary purpose was to make chlorofluorocarbons (CFCs), which were used as refrigerants and propellants and were the key target of the Montreal Protocol, enacted in 1987.

Toxic 'carbon tet' lingers in air near schools 2009

In a statement, the Formaldehyde Council said the National Academies of Sciences, which advises the government, should launch a thorough study of the chemical's safety.

Study links formaldehyde to more common cancers 2009

Eleven states have banned the chemical's use in certain products, typically baby bottles and other children's goods; Canada, China and the European Union have similar restrictions.

The Center for Public Integrity: Federal regulators have failed to act on toxic chemical, report says The Center for Public Integrity 2012

But others argue not likely -- bedbugs developed a resistance to DDT before the ban see here, here, and here; and the chemical's phaseout in the 1970s has not led to a similar resurgence in mosquitoes or other pests.

Bill Chameides: Is Propoxur the Way to Not Let the Bedbugs Bite? Bill Chameides 2011

A recent leaked EPA memo implicates the pesticide clothianidin as a contributor to honeybee die-offs, although sadly the EPA has yet to curb the chemical's use in the U.S.

Tara Lohan: Why You Should Really Be Concerned About the Global Wildlife Die-offs Tara Lohan 2011

According to Picaridin.info, the chemical's efficacy is similar to DEET's but is "more pleasant to use and much less likely to cause skin irritation."

Bill Chameides: Keeping the Skeeters Off Bill Chameides 2011

In response to the recent spate of publicity over the meaning of the California vote, the FDA reaffirmed the chemical's safety.

Jon Entine: End Game on Bisphenol A? Have we reached a tipping point on the science of this ubiquitous chemical? Jon Entine 2011

Reviews by the National Toxicology Program, Center for Disease Control and Prevention and by World Health Organization scientists, among many others, show that injecting BPA into animals is a poor proxy for evaluating the chemical's effects in humans because we metabolize BPA and are far less sensitive.

Jon Entine: End Game on Bisphenol A? Have we reached a tipping point on the science of this ubiquitous chemical? Jon Entine 2011

According to Picaridin.info, the chemical's efficacy is similar to DEET's but is "more pleasant to use and much less likely to cause skin irritation."

Bill Chameides: Keeping the Skeeters Off Bill Chameides 2011

The researchers also found that rats exposed to the hormone-suppressing chemical didn't become immune to the chemical's effects over time.

Stress hormone may be key to alcoholism 2010