Nitpicking, but Shenzhen isn't one of the world's most polluted cities. Out of China's big four cities, it's the least polluted, and this is a reason why it rec

Nitpicking, but Shenzhen isn't one of the world's most polluted cities. Out of China's big four cities, it's the least polluted, and this is a reason why it recently ranked so highly among expats. It is definitely magnitudes less polluted than Beijing and Shanghai.