The report said nine out of 10 people globally are breathing poor quality air while nearly 90 per cent of air pollution related deaths occur in low and middle-income countries, with nearly two out of three occurring in WHO's South-East Asia including India and Western Pacific regions.
"It is a public health emergency," said Maria Neira, the head of the WHO's department of public health and environment.
It said that 94 per cent are due to noncommunicable diseases - notably cardiovascular diseases, stroke, chronic obstructive pulmonary disease, lung cancer and air pollution also increases the risks for acute respiratory infections.
A WHO South East Asian Region (SEAR) statement said: "Air pollution is the world's biggest environmental risk to health and must be addressed on a priority basis as it continues to rise, causing long lasting disease and illness in addition to around 7,99,000 deaths annually in countries of the WHO SEAR."
More From This Section
The highest - 2,49,388 died of IHD in India, the report said adding that 1,95,001 people died of stroke. Similarly, 11,05,00 people died of COPD while 26,334 people died of lung cancer. However the data for India is of 2012.
Giving data of 2012, WHO in its new report said in terms of PM10, Gwalior was the most polluted and had an average mean micrograms per cubic metre (ug/m3) of 329.
"The new WHO burden of disease estimates shows that 94 per cent of the premature deaths caused by air pollution are due to cardiovascular diseases, chronic obstructive pulmonary disease and lung cancers.
"The remaining are from acute respiratory infections in children under five years of age. The magnitude of the health impact of air pollution calls for urgent action to prevent these avoidable risks and deaths," said Poonam Khetrapal Singh, Regional Director for WHO South-East Asia.