From article in the Economist:
The muck that spews from Chinese factories most immediately affects those unlucky enough to live nearby. In January 2013 the air of Beijing hit a level of toxicity 40 times above what the World Health Organisation deems safe. A tenth of the country’s farmland is poisoned with chemicals and heavy metals. Half of China’s urban water supplies are unfit even to wash in, let alone drink. In the northern half of the country air pollution lops five-and-a-half years off the average life.