Wales and the north-west of England have the most affordable homes for buyers looking to live in the most unpolluted parts of the UK.
Towns from both of those areas dominated the top 10 of regions offering both affordable property prices and low pollution levels.
However, almost half of the 50 clean-air hotspots identified in the research are in the south-west of England.
The county borough of Blaenau Gwent claimed first place as the most affordable place to live with the cleanest air to breathe, followed by Copeland in Cumbria, Merthyr Tydfil in south Wales and Barrow-in-Furness, also in Cumbria.
The least affordable area to live with the cleanest air were named as Purbeck in Dorset, the Cotswolds, South Hams in Devon, North Norfolk and West Oxfordshire.
The Clean Air Affordability Monitor identified areas with the least polluted air, based on environmental data, and rated them by their property affordability using transaction data from the Land Registry.