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The latest eruption of a Hawaii volcano isn't threatening any infrastructure, but health officials are warning the public about air-quality hazards from volcanic smog known as vog. Kilauea, one of the most active volcanoes in the world, began erupting on September 10. On September 11, state health officials said the eruption brought vog to some parts of the Big Island, causing poor air quality. The health department's air quality map Tuesday showed Pahala, downwind of Kilauea's summit, as "unhealthy for sensitive groups."