'Air pollution affects my heart condition'
10 July 2013 Last updated at 10:42 BST
More should be done to clean up air pollution and reduce the impact on people with weak hearts, a study has claimed.
The report, funded by the British Heart Foundation and published in The Lancet, said pollution is harming - and in some cases killing - people with weak hearts.
It also found that many UK cities often exceed safe levels set by the European Union.
Joanne Ward, a heart failure patient and ambassador for the British Heart Foundation, spoke about her case.