1.   And how long will Asians tolerate the fact that the economic boom has left them with five of the seven most polluted cities in the world?

2.   But no one has moved to clean up the most polluted city, Matamoros, where industrial pollutants have been found at thousands times safe levels.

3.   For the first time, bakeries, landfills, dry cleaners, some service stations and other businesses are being required to reduce emissions in polluted cities.

4.   One is to continue to rely on older technologies that condemn us to a future of polluted cities and further warming.

5.   Overall, the scientists said, living in a moderately polluted American city raises risks of heart and lung ailments as much as living with a smoker.

6.   Other polluted cities in the region, such as Mexico City and Sao Paulo, have similar regulations in place for industry, yet compliance is low.

7.   Pope declined to discuss findings for specific cities, but said that the reduction in life expectancy of three years was calculated for the most polluted cities.

8.   The EPA has for years sought to control ozone pollution through regulations that designate some highly polluted cities as nonattainment areas.

9.   Under the legislation, the most heavily polluted cities in the country must use oxygenated fuel in efforts to reduce emissions.

10.   Bad air and water are the two most serious environmental problems in Mexico City, described as the most polluted major city in the world.