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It's August as well as the words "Back to School" ring loud inside the ears of parents, students and educators. Schools, families, businesses and communities are hearing the rally cry and readying themselves for your inauguration of a new school year!! Some are celebrating the brand new start while others are bracing to get a new year as well as the nervous about the unknown. 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.