Limonene is moderately toxic by ingestion. Poisoning may affect the kidneys. The oral LD50 is 5 g/kg for a rat and 5.6-6.6 g/kg for a mouse. Local effects include irritation to the eyes, skin, and respiratory tract. Acute exposure may cause sore throat, coughing, shortness of breath, dizziness, and nausea. Chronic exposure data is not available. A target of 100 ppm was chosen because of the above information and data from similar analytes