The Turrialba volcano may have stopped emitting ash, but the noxious gases linger on. The Observatorio Vulcanológico y Sismológico de Costa Rica said that a new network of four monitoring stations has been tracking the emissions of gases, and there has been an increase in sulfur dioxide, hydrogen sulfide and microscopic particles.
A lot of Central Valley residents already knew this because they had been detecting hydrogen sulfide with their noses. The gas smells like rotten eggs.
They may also have noticed a sore throat. The Observatorio also said that sulfur dioxide results in acid rain, which is not great for vegetation. The concentration was just 28 parts a billion, not enough for a health emergency.
There were no reports of ash falls or smelly gas Sunday, said the Observatorio. Still figuring out what is going on with the mountain has been difficult.
The Observatorio said that the clouds cleared a little bit at 6 a.m., and the monitoring cameras on the volcano summit showed just emissions of vapor that was mainly water and gas.
Tremors under the volcano diminished significantly at 1:15 a.m. which suggested that a lengthy emission of ash had ceased.
The aerosols put into the atmosphere by the volcano also can cause lung problems, particularly with people who have a weakness there.
Moderate rains in the Central Valley had a cleansing effect on the air.