The National Emergency Commission (CNE) recommended Thursday afternoon that the Education Ministry suspend classes in five cantons in Cartago province, including Turrialba, Jiménez, Alvarado, Oreamuno and Cartago. CNE also recommended that the National System of Conservation Areas close the Irazú Volcano National Park following the eruptions at the Turrialba Volcano on Wednesday evening. Authorities had already closed the Turrialba Volcano National Park and announced they would closely monitor Poás Volcano.
The Civil Aviation Administration issued a warning for all airplanes to avoid a 32-kilometer (20-mile) radius around Turrialba Volcano and up to an altitude of 5.8 km (19,000 feet). Costa Rica’s largest airport, Juan Santamaría International Airport, outside of San José, is not within the bonds of the preventive measures. No flights have been grounded or interrupted so far. Civil Aviation Director Álvaro Vargas said that additional measures could be adopted as the situation develops. Volcanic ash can affect the operations of an airplane’s motor and turbines.
http://www.ticotimes.net/2014/10/30/costa-rica-emergency-officials-on-alert-following-explosions-ash-spewing-at-turrialba-volcano