Setting
Shandong Provincial Hospital is located in Jinan, the capital city of Shandong Province, China. Jinan was selected for our study because it ranks highly among polluted cities of China. Jinan is a northern inland city at 36° 40′ latitude and 116° 57′ east of Greenwich, with complex natural terrains and poor airflow and ventilation. Situated about 400 km south of Beijing, the city covers an area of 8227 km