Definition of "Zaozhuang"

By early evening Thursday, the pollution level in Shanghai was hovering at 340. At least 16 other cities in four provinces in eastern China were also reporting pollution levels over 300. In Zaozhuang, a city of nearly four million in Shandong Province, the pollution index hit 500, the maximum reading on the Chinese scale.

2013 December 5, Austin Ramzy, “Air Pollution Shrouds Eastern China”, in The New York Times‎, archived from the original on 2022-07-17, Sinosphere‎