Rethink storing mothballs in the house. According to the Columbia University researchers, "A box of "old fashioned" mothballs contains 396 grams of naphthalene, which is sufficient to raise the average residential indoor air concentration to approximately 200 micrograms per cubic meter over a period of 1 year, though in small homes or apartments this would be expected to be much higher. Exposures of this magnitude are commensurate with industrial exposures to ... jet fuels." Everyone in the home is exposed to the vapors if moth balls are not used properly.