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The smell of toxic sulphur dioxide and burning trees hanging in the air. >> all around is a sulphur smell. i think were one street over from the lava right now. >> reporter: officials say the air quality is an immediate threat to life. the governor declaring a state of emergency. >> its a difficult thing to watch. the lava flow is unpredictable. not exactly certain what course it will take. >> reporter: thursdays eruption came hours after a 5.0 earthquake jolted the big island. on monday, one of...