Separate patient from fumes/toxic agent
Decontaminate if not done on scene
Secure airway if necessary and ventilate, observe for respiratory distress and airway compromise
Oxygen at 6-12 liters per minute via mask
Remove victim from the gas
Fresh air or oxygen
Observe for sequelae  from hypoxia (myocardial infarction, cerebral injury)
Aerosolized bronchodilators
Corticosteroids in patients with history of reactive airway disease
Ensure adequate oxygenation, ventilation, pulmonary toilet and fluid resuscitation
Inhalation injury
Smoke inhalation injury
Cyanide
Thoracic trauma
Carbon monoxide
Trachobronchial injury
Chloramine
Parapharyngeal space infection