Fogging is a process by which a liquid is mixed with a gas at high pressure for optimal air transmission, resulting in the creation of a "cloud" that increases the penetration power of the liquid on any surface within its reach.

This system is used in fire extinguishing systems (high pressure water and CO), in motorsports (gasoline and compressed air) and in medicine, among other applications.

In medicine, the substance to be administered is combined with a liquid medium, often saline, and then with the help of a gas, usually oxygen, to create a vapor that can be inhaled by the patient.

The indications for nebulization are few but important, among them we can mention:

• - Administration of drugs that are only available in liquid form.

• - Need to administer a medication at high doses through the bronchopulmonary route").

• - Patients who are not able to correctly use conventional inhalation systems (due to physical or mental incapacity or due to the severity of the process) and who have not been able to be taught in education and training workshops organized to correctly teach inhalation techniques.[1]​.

• - Nebulization is a procedure mainly used for respiratory diseases.

One of the main advantages of nebulization therapy is its use in younger children or infants, in respiratory diseases, where the aim is to administer the medication and, on the other hand, fluidize the secretions for better elimination.[2]​.

One of the main contraindications to nebulization therapy is in patients with ongoing hemoptysis. Hemoptysis is understood as the expulsion of blood through the mouth from the infraglottic airways.

• - Nebulizer.