Tungurahua began rumbling in May in its loudest activity since 1999.
People fled their homes in the town of Casua as the volcano began spewing lava and poisonous gases.
No casualties are reported but roads and bridges are blocked and villagers have lost cattle and crops.
Many villagers fled to the nearby town of Pingue, where it's safer.
Troops helped the evacuation from the volcano, which means "throat of fire" in the local language.
Residents of Cotalo with stones projected by the volcano. The government has promised $5.7m to help people.