6. The use of smaller words and shorter sentences The event takes place in English Bay at 10:00 PDT on four nights, beginning on the Wednesday and ending on a Saturday, on the two week period during July and August. Each of the four performances have no less than a three-day separation for preparation for an additional competitor. Three companies representing their countries perform a twenty-five minute firework display set to music. A grand finale is performed on the last day by each of the competitors. 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.