Environment in Cardiff
Welsh councilSouth Wales. 381,516 people (mid-2025 estimate) in 142 square kilometres.
6 layers about environment for Cardiff, each at the level its publisher released it, with its own date and source.
Radon Affected Area by ward
Worked out by Open Index · 2022
Cardiff’s 28 wards range from 0% to 100%.
Radon potential
1 km gridPublished as points, so there is no single figure for Cardiff. The map shows each one.
People in radon Affected Area squares
CouncilAbout 60% of people in Cardiff live in a 1 km square that the radon atlas marks as a radon Affected Area.
Across the UK the figure is 44%.
Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas.
- Against Wales
- 28% lower83%
- Against the UK
- 36% higher44%
Nitrogen dioxide (NO2)
1 km gridPublished as points, so there is no single figure for Cardiff. The map shows each one.
Fine particles (PM2.5)
1 km gridPublished as points, so there is no single figure for Cardiff. The map shows each one.
Green space
OutlineGreat Britain onlyPublished as points, so there is no single figure for Cardiff. The map shows each one.
Flood zones
OutlineEngland and Wales onlyPublished as points, so there is no single figure for Cardiff. The map shows each one.