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These chemicals have not undergone thorough safety evaluations, and do not just simply evaporate, but are designed to hang in the air 30-90 days or more. Such chemical applications are of most concern to pregnant women, in which even a minute dosage of a disrupting chemical can cause grave harm to the fetus. This is over and above the real concern for people who are trying to live a chemical-free lifestyle and who won't be able to escape the hundreds of square miles of densely populated areas to be sprayed, or for those who are sensitive to chemicals, or who are in poor health.