In past, many scientists had always treated the topic in which they tryed to explain why cityes are generally hotter than suburban places.

Now, a new research, says that the urban heat, born by air pollution, may also increase temperature of other places in the world, even far away from the city.

This is the result from the Scripps Instituition of Oceanography at the University of California, San Diego, which confirm that cities Northern Hemisphere can warm rural places up to 1°C. The reason comes from global air flow.