Toxicity:   Methoxychlor is a chlorinated hydrocarbon pesticide, which accumulates in fat cells and can enter mother's milk.  It is also a neurotoxins and can over stimulate the central nervous system.  P-Dichlorobenzene, aromatic hydrocarbons, and naphthalene are central nervous system depressants, which can cause confusion, headaches, lack of concentration, and symptoms of mental illness.  Salicylates can cause strong allergic reactions and are very toxic.  Formaldehyde is assumed to be carcinogenic.  Piperonal butixide is a suspected carcinogenic (cause cancer). Environmental Impact: Chlorinated materials can form other compounds (like DDT), which break down slowly in the ecosystem.  Petroleum distillates, aromatic hydrocarbons, formaldehyde, and very toxic materials such as salicylates are considered hazardous waste.  Aromatic hydrocarbons contain impurities, which contaminate the air and water.   Petroleum-based products are non-renewable resources, are slow to break down in the environment, and can contain impurities, which contaminate air and water.