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toxic chemical exposure may, exposure to toxic chemicals, exposure to dangerous chemicals, exposure to harmful chemicals, exposure to toxic chemicals symptoms, exposure to chemical hazards, exposure to hazardous chemicals, exposure to certain chemicals, what is toxic exposure, is chemical exposure dangerous, symptoms of toxic chemical exposure, chemical hazards and toxic substances, exposure to toxic fumes, risk of toxic chemicals, exposure to toxic gases, exposure of living things to toxic substances, what is chemical exposure, environmental exposure from chemicals, exposure to harmful substances, exposure to environmental toxins, exposure to hazardous chemicals and materials, toxic chemicals and their effects, toxic and harmful chemicals, toxicity levels of chemicals