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] |