Table 4 Respiratory intake symptoms and exposure limit level of methanol

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]