There are many diseases that infect pigs by way of Airborne transmission. This paper reviews the general principles of the airborne pathway, including aerosol production, decay and inhalation. Also discussed is practical issues regarding aerosol sampling and sample analysis. Details of the aerobiology of porcine diseases, including foot-and-mouth disease, Aujesky’s disease, and respiratory diseases, are explained. Some other diseases are discussed based on the evidence gathered that they are transmitted by air. To prevent the spreading of airborne diseases, dust reduction, air filtration, air disinfection, vaccination should be considered.