see also Burns
Effect of parenchymal injury may be delayed clinically and radiologically for up to 4 hours
Early
Toxic inhalations (asphyxiants/pulmonary irritants)
Late
| Dry | Moist | |
| Site of injury | Upper airway only | Airways and Parenchyma |
| Type of injury | Oedema +/- ulceration and haemorrhage. | Alveolar injury, ARDS |