世界银行估计，中国的年度总空气污染成本 — — 由中国人表示愿意为降低死亡风险而支付的金额计算得出 — — 竟相当于国内生产总值的4 % 。
The World Bank estimates that China’s total annual air-pollution costs – based on what Chinese themselves indicate they are willing to pay to reduce their risk of dying – could be as high as 4% of GDP.