The Turrialba volcano erupted at least dozen times over the weekend, starting at just 36 minutes after midnight Saturday.
Much of the ash went to the west because of the winds at the time. There were reports from Guadalupe of ash and the strong smell of sulphur.
Ash depths of up to an inch were reported in the immediate area of the volcano with half inch to the west.
The Red Sismológica Nacional published a list of eruptions based on tremors registered from the mountain.
One eruption was reported to have sent a plume of ash 4.5 kilometers into the air. One eruption at 2:30 p.m. Saturday lasted nearly two hours.
The ash fell along with a light rain that continued for much of Saturday and Sunday in the Central Valley.
Early today the Red reported a new eruption at 12:33 a.m.