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On its own, digital telephone service sounds pretty appealing: unlimited calls, cheaper phone bills, great features and much more. But along with a youtube video phone, digital voice service looks amazing. Video phones let users see the other person in lieu of simply hearing one another?s voice on the line. Though it may seem, or look, too good to be true, most analysts agree that video phones will probably be within the majority of households within the near future. The fine particles are mostly made from gases. There are four major origins for that gases which are responsible for these particles: rock (vaporized during combustion or casting), carbon from combustion, organic carbon, sulfates and nitrates. Take sulphur dioxide. It is created during engine combustion, but when it climbs into the atmosphere and mixes with rain it will become sulphuric acid. We all probably know very well what that will do- since it is highly corrosive and dangerous in concentration.