Environment in Welwyn Hatfield
DistrictThe south west of the East of England. 121,748 people (mid-2025 estimate) in 130 square kilometres.
9 layers about environment for Welwyn Hatfield, 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
Welwyn Hatfield’s 16 wards range from 0% to 100%.
Radon potential
1 km gridPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
Road and rail noise by postcode
PostcodeEngland onlyPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
People in radon Affected Area squares
CouncilAbout 51% of people in Welwyn Hatfield 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 East of England
- 2.3 times22%
- Against the UK
- 16% higher44%
People in loud road or rail noise
CouncilEngland onlyAbout 3.0% of people in Welwyn Hatfield live where road or rail noise is modelled at 65 decibels or more.
Worked out by Open Index from Defra's strategic noise maps and census output areas.
- Against East of England
- 43% higher2.1%
- Against the UK
- 17% lower3.6%
Nitrogen dioxide (NO2)
1 km gridPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
Fine particles (PM2.5)
1 km gridPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
Green space
OutlineGreat Britain onlyPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
Flood zones
OutlineEngland and Wales onlyPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.
Flood risk by postcode
PostcodeEngland onlyPublished as points, so there is no single figure for Welwyn Hatfield. The map shows each one.