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Those that support animal testing claim that is really a necessary practice. They explain that companies that depend upon animal testing do use humane techniques to feed, house and care for the animals. Supporters also declare that alternatives to animal testing are not as far reaching, lacking to be able to figure out how cosmetic products affect living tissue and organs. 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.