Figure 4: Histopathology of the lung of rat after 28 days inhalation of ethylene glycol. No abnormal findings were observed in all the groups. tb, terminal bronchioles. H & E. Mag= × 100 for all the groups of five male rats were exposed to ethylene glycol (0, 4, 20, 100 mg/m3) for sub-acute inhalation toxicity (28 day study). Low: 4 mg/m3, middle: 20 mg/m3, high: 100 mg/m3.