If you are traveling internationally you should be aware that in some countries, aircraft passenger compartments are sprayed with insecticide while passengers are on board. This is done to prevent the importation of mosquitoes and other insects from one country to another. While the World Health Organization has found these procedures to be safe, they may aggravate certain health conditions, such as allergies, asthma, and certain respiratory disorders.
Countries where this process generally takes place include those in Latin America, the Caribbean, Australia, and the South Pacific regions. For more information about these procedures, contact your travel agent or airline.