The Servicio Nacional de Salud Animal said that it has begun fumigating the cargo area and the baggage of aircraft entering or leaving the country.
The agency had announced this in the past, but the announcement did not say that the fumigation would ignore the passenger compartment. Those passengers with respiratory conditions have complained elsewhere of fumigation.
In some countries and on some airlines, flight attendants spray an aerosol to kill insects before the plane reaches the ground. Less than 10 countries require this, according to online sources.
The animal health agency said it has its own crews at Juan Santamaría, Daniel Oduber and Tobías Bolaños airports to handle international flight. The agency said that airlines were being charged 10,000 to 20,000 colons for this service. It said the work takes just five minutes.
The agency said it was trying to prevent the export or introduction of harmful insects such as mosquitoes that carry yellow fever.