The quality of air pollution data provided by individual countries varies considerably, and WHO does not compile a ranking of the world's most polluted cities. Updated Thu, May 12th 2016 at 12:59 GMT +3Over 80 percent of the world's city dwellers breathe poor quality air, increasing their risk of lung cancer and other life-threatening diseases, a new World Health Organization (WHO) report warned Thursday. Crucially, key African centres like Nigeria’s mega-city Lagos were excluded from the list because of the sparse availability of air quality data in many parts of the continent, WHO said. The UN agency's latest air pollution database reveals an overall deterioration of air in the planet's cities, and highlights the growing risk of serious health conditions also including stroke and asthma. - Key factors -Carlos Dora, coordinator at WHO's public health and environment department, pointed to several key factors that determine the quality of a city's air.

Source: Standard Digital May 12, 2016 04:34 UTC