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Table 4 Respiratory intake symptoms and exposure limit level of methanol

From: Estimations of the lethal and exposure doses for representative methanol symptoms in humans

Exposure level (mg/L) Symptoms Remarks
160–780 Health symptoms [22]
200–375 Recurrent headaches [27]
200 [38]
250 [38]
228.5–417.7 Optic neuritis, Unconsciousness, Vomiting [36]
300 Amblyopia [34]; [35]
365–3080 Blurred vision, Headache, Dizziness, Nausea, Shortness of breath, Severe upper abdominal pain, Back pain, Difficulty breathing, Diarrhea, Bradycardia [22]
800–3000 Chronic intoxication [16]
1103–2220 Blindness, Optic neuritis, Loss of pupillary reflex, Amblyopia, Metabolic encephalopathy, Vomiting, Unconsciousness [36]
3000 Visual changes, Headache, Respiratory changes [20]
1200–8000 Symptoms of reduced vision, Chronic poisoning [20]
8300 Temporary blindness [22]