[2]
The US Centers for Disease Control and Prevention have released results of a study finding that girls with higher exposures to a common household chemical tend to start their periods an average of seven months earlier than girls with lower exposures to this chemical.
The chemical they studied is dichlorobenzene, a solvent used in some mothballs and solid blocks of toilet bowl deodorizers and air fresheners.
Read more about it in Environmental Health News [3].