1) slopes will help make the floating pollutants in the atmosphere are easy outfitting dock blows. 2) surrounded by mountain areas or areas that are pan basin. Cause the accumulation of pollutants in the air and causes extreme "back temperature (Temperature Inversion)" easily. 3) is a Valley area. Allow the flow of air pollutants transfer is going to be difficult. Because of the airflow to blow took place, to spread spread is less.
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