... other chemicals such as resins. Most of the 1,4-dichlorobenzene enters the environment as a result of its use in moth-repellant products and in toilet-deodorizer blocks. Because it changes ... also contains 1,4-dichlorobenzene. Route of exposure People are exposed to 1,4-dichlorobenzene mainly by breathing vapors from 1, 4- dichlorobenzene products used in the home. 1,4-Dichlorobenzene ... had a concentration of 1,4-dichlorobenzene up to 9.2 parts per billion in their blood. The effect of 1,4-dichlorobenzene exposures on the general population at current levels of exposure is not...