Shandong Province and Tianjin Municipality have a "significant influence on Beijing's air quality", partly due to the prevailing south/southeasterly flow during the summer and the mountains to the north and northwest.
Provinsi Shandong dan Kotamadya Tianjin memiliki "pengaruh yang signifikan terhadap kualitas udara Beijing", sebagian karena aliran selatan / tenggara berlaku selama musim panas dan pegunungan di utara dan barat laut.