On 3 August OVSICORI-UNA reported that plumes of magmatic gases, water vapor, and aerosols continued to rise from Poás?s vent A (Boca Roja), and plumes of water vapor and abundant yellow particles of native sulfur were emitted from vent B (Boca Azufrada).
Plumes rose as high as 1 km above the vents and drifted SSW.
Incandescence from the bottom of the crater was recorded at night by the webcams.
Recent measurements indicated that sulfur dioxide was emitted at a rate of 1,000-1,500 tons per day, which were values similar to those measured in the first months of 2017, before the phreato-magmatic eruptions of April and May.
Gas plumes continued to rise from the vents and drift SW and NW at least through 8 August.
Source: Observatorio Vulcanologico y Sismologico de Costa Rica-Universidad Nacional (OVSICORI-UNA)