Public Health Wales estimates that up to 1,400 deaths each year can be attributed to air pollution (Air pollution and health in Wales, PHW).
Mae Iechyd Cyhoeddus Cymru yn amcangyfrif y gellir priodoli hyd at 1,400 o farwolaethau y flwyddyn i lygredd aer (Air pollution and health in Wales, Iechyd Cyhoeddus Cymru).