The time line of the Guagua Pichincha volcano activity, daily ER visits, and weekly precipitation. Footnotes: Time series of daily cases of ER visits for first 200 days are shown. The most noticeable fumarolic activity was observed a week prior eruptions (shown as a pink bar). On April 10th and 11th (days 100 and 101), the volcano erupted approximately 18 times. More than 100 seismic tremors were recorded during the eruptions. Ash clouds rose 0.8 km into the air on April, 10th and then another cloud of vapor was seen on April 16th. A yellow alert was issued for the city Quito. The study periods (2, 3, and 4) are indicated as a red bar.