Authorities closed Guatemala's international airport Thursday after the nearby Pacaya volcano showered as much as 3 inches (8cm) of ash over parts of the city.
La Aurora airport would be closed at least until noon Friday, and possibly longer, said Angel Perez, a spokesman for the Central American country's Civil Aeronautics Office.
The volcano is about 15 miles (25km) south of the Guatemalan capital.
Two to three inches of ash accumulated on streets in some southern parts of the city, and officials imposed limits on trucks and motorcycles to help speed up traffic slowed by the ash.
The government urged residents not to leave their homes unless there was an urgent need, and issued a state-of-disaster declaration, making it easier to disburse funds to deal with the problem.