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Particulate smog is a mixture of solid and liquid particles which are suspended in mid-air that you just breathe. It is best to classify air particles from the aerodynamic properties as these properties determine the removal of them from the air, and where they deposit inside your breathing. * Heredity - Everyone receives genes from other parents and grandparents. Almost everyone that has an anxiety disorder carries a parent, grandparent, or other relative with anxiety syndromes of some type. In cases where the little one becomes separated from your parent from a young age, certain characteristics will surface which are like those of the parent. This indicates that the disorders aren't solely determined by life experiences as some have though. Clinical studies substantiate the pass-down-system of hysteria.