11.   Delhi is considered one of the most polluted cities in the world.

12.   EU Environment Commissioner Ritt Bjerregaard urged EU governments to consider new limits on traffic in polluted cities, use of special fuels and new investment in public transportation.

13.   Greenpeace pleads for help in polluted Russian city AP Photo available.

14.   I am talking about the danger of air pollution in Indonesia, especially in Jakarta, which after Mexico and Bangkok is the worst polluted city in the world.

15.   It hopes it will make this heavily polluted city more livable and cut down on the pollution that regularly blankets it on many days of the year.

16.   Most environmentalists hailed the move, saying it would go a long way to clean up New Delhi, which ranks among the most polluted cities in the world.

17.   New Delhi is the fourth most polluted city in the world, and deteriorating air quality may soon push it to the top of the league.

18.   Some were held in the most polluted cities in the world.

19.   The report cited Barcelona, Spain, as the second most polluted city.

20.   The worst polluted cities are Guangzhou, Foshan and Yunfu, which border Hong Kong and Macao.