For a few days last month, London had seen more-polluted air than Beijing, which are likely to occur more frequently -- not because London's air is getting worse, but because Beijing's has gotten so much better, Bloomberg reported xhtxs.cn/tyh
For a few days last month, London had seen more-polluted air than Beijing, which are likely to occur more frequently -- not because London's air is getting worse, but because Beijing's has gotten so much better, Bloomberg reported xhtxs.cn/tyh
