According to Costa Rican Public Security Ministry's Air Surveillance Service, volcanic ash poses a risk to planes, The Tico Times explains.
Turrialba Volcano, located in Costa Rica's central Cartago Province, erupted three times on Thursday, sending volcanic ash more than 1 kilometer (about 3,280 feet) into the air. Winds carried the ash 67 kilometers (42 miles) from the volcano to the country's capital, San Jose.
Costa Rica's National Commission for Risk Prevention and Emergency Management announced that an evacuation has been launched in several settlements in the Turrialba Volcano region. According to the commission, Turrialba's Thursday activity was the most powerful eruption of the volcano since 1996.
Turrialba has three craters and is among Costa Rica's largest volcanoes. It had at least five large explosive eruptions in the past 3500 years.