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12 May 2016, 08:13 | Updated: 12 May 2016, 08:15
Oxford is among the British and Irish locations named and shamed for breaching safety levels for air pollution.
The World Health Organisation warn poor air quality is a major cause of disease and death.
One way the global health body assesses air quality is by examining the levels of a type of pollution known as 'particulate matter' - also known as PMs.
WHO's latest data shows Oxford breached the safe limit set for PM10.
As air quality declines, the risk of stroke, heart disease, lung cancer, and chronic and acute respiratory diseases, including asthma, increases for the people who live in these areas, the health body said.
Dr Flavia Bustreo, WHO's assistant director general for family, women and children's health, said: ``When dirty air blankets our cities, the most vulnerable urban populations - the youngest, oldest and poorest - are the most impacted.''