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The name Opal comes from three sources. One is the Latin word "Opalus". The second one is from your Greek word "Opalliois" meaning a difference of colour lastly from your ancient Sanskrit word "Upala" meaning precious stone. If one speaks of gemstone over these tongues the saying Opal would be Opallious upala, which suggests precious stone.Which shows of assorted colours when shifted against light. Particulate air pollution is really a combination of solid and liquid particles which are suspended up which you breathe. It is best to classify air particles through the aerodynamic properties since these properties determine removing them through the air, and where they deposit in your the respiratory system.