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Why Low‑Cost Sensors Matter for Volcano AlertsThe Guardian reports that VolcanoTech, a spin‑out from the University of Sheffield, has turned a smartphone camera into an ultraviolet (UV) detector capable of measuring rising levels of sulphur dioxide—a key precursor to volcanic eruptions. By pairing the camera with a Raspberry Pi processor, the company offers a fraction‑priced alternative to traditional volcanic gas monitors. VolcanoTech’s Pi‑cam: UV‑Enabled Smartphone Camera for Sulphur Dioxide DetectionThe device, dubbed Pi‑cam, modifies a standard smartphone camera to see in the UV spectrum. When magma ascends, it releases dissolved sulphur dioxide; the gas fluoresces under UV light, and the sensor quantifies this fluorescence. Key features include:Smartphone camera retrofitted for UV sensitivityRaspberry Pi for on‑board data processingReal‑time transmission of gas concentration levels Cost Structure Shows Fraction of Traditional SystemsConventional sulphur‑dioxide monitoring stations can cost tens of thousands of dollars per unit. The Pi‑cam network, by contrast, leverages off‑the‑shelf components, driving the price down to a few hundred dollars per sensor. This cost reduction enables deployment in regions that previously could not afford comprehensive monitoring. How Affordable Sensors Could Redefine Volcanic and Air‑Quality MonitoringInstalled sites already span Ecuador, Chile, Mexico and Indonesia, with plans for Costa Rica and Argentina. A dense, low‑cost sensor grid promises:Continuous, high‑resolution maps of volcanic gas emissionsIntegrated air‑quality data for urban health applicationsEarlier eruption warnings for at‑risk communities Scaling the Network: What Comes Next for Global Eruption ForecastingExperts anticipate that as more governments and research institutions adopt the technology, the data pool will expand, feeding machine‑learning models that improve eruption forecasts. The convergence of meteorology, volcanology and citizen‑science platforms could soon deliver a unified view of both air pollution and volcanic risk worldwide.