When a short period of exposure to formaldehyde gas results in transient eye and upper respiratory tract irritation without acute damage to the lower respiratory tract, it is called a formaldehyde irritation reaction. These reactions are transient and may improve on their own after removal from exposure.
Acute formaldehyde poisoning should be removed from formaldehyde exposure as soon as it is detected, transferred to a ventilated place, and treated in a timely manner, acute formaldehyde moderate can be cured.