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Can “Unlucky Number 4” Be Lucky Too? How the Chinese Superstition About “4” Made Possible a Study on the Health Effects of Air Pollution in Beijing

When the combination of a vehicle restriction policy in Beijing and the Chinese superstition about the number 4 led to just such a phenomenon, Harvard-China Project affiliate Professor Jing Cao and her fellow collaborators seized the opportunity to study the health effects of air pollution in Beijing.