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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. As these goods are comprised of different chemical substances, they're able to pose a threat to your skin if used too much or over used. Some people could be allergic to particular chemicals that could possibly be contained in these items. Therefore when purchasing, we have to always learn the package the components that is used to make the merchandise. Certain chemicals could cause reactions on skin and rather than beautifying you, they will often cause that person to have skin ailment and perhaps pimples. If you were to apply a lot of different creams and other varieties of cosmetics, they might also pose a threat to your epidermis like a combination of various different cosmetics is probably not good.