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A unified, global effort is needed to combat air pollution, the WHO said.
Dr Maria Neira, director of WHO's department for Public Health, Environmental and Social Determinants of Health, added:
More must be done to combat air pollution after seven million people died from diseases related to it in 2012, the World Health Organisation (WHO) warned.
Air pollution is "the world's largest single environmental health risk", according to WHO, which suggested people on low to middle incomes would be most at risk.
A new WHO report suggests there is a link between air pollution and heart disease, respiratory problems and cancer.
Many of the deaths in 2012 occurred in low and middle-income countries in south east Asia and the western Pacific region, where about 3.3m died as a result of indoor air pollution and 2.6m deaths were related to outdoor air pollution, WHO said.
Dr Flavia Bustreo, WHO's assistant director-general for family, woman and children's health explained: "Cleaning up the air we breathe prevents non communicable diseases as well as reduces disease risks among women and vulnerable groups, including children and the elderly."