Road & rail noise map for Hemel Hempstead
Town in Hertfordshire, Eastern
We analysed 2,470 postcodes in and around Hemel Hempstead, Hertfordshire against DEFRA's Strategic Noise Mapping (Round 4, 2022). 20% of them (504) have mapped road noise of 55 dB or more by day, and 2% have mapped rail noise. 78% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at HP3 9SE (road noise 70.0–74.9 dB by day).
Noise map of Hemel Hempstead
How many postcodes are affected?
Road noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 13% (330) | 5% (117) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 6% (136) | 5% (112) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 1% (36) | <1% (16) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (2) | <1% (1) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 80% | 90% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | 1% (28) | 1% (25) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | <1% (15) | <1% (6) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | <1% (5) | 0% (0) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | 0% (0) | 0% (0) |
| 75.0 dB or more day · 70.0 dB or more night | 0% (0) | 0% (0) |
| Below mapped bands / not mapped | 98% | 99% |
Share of the 2,470 postcodes within ~5 km of the Hemel Hempstead centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Hemel Hempstead
Check a specific postcode
Example searches: HP3 9SE · HP2 4FL · HP1 1AX · HP1 1AJ · HP1 1AT · HP1 1AG
What this data does — and doesn't — cover
- Modelled, not measured.These are DEFRA's computer-modelled estimates (Round 4, 2022), not microphone readings at your door.
- Major sources only. The model covers major roads, major railways and large urban areas. Smaller local roads, neighbours, pubs, building sites and aircraft are not included.
- No mapped noise ≠ quiet. If a location shows no band, it means it falls outside the mapped contours — not that it is silent.
- 2022 snapshot.New roads, developments or traffic changes since 2022 won't show. The next DEFRA round is due around 2027.
More detail on the methodology page.
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Nearby areas
Frequently asked questions
- How noisy is Hemel Hempstead?
- We analysed 2,470 postcodes in and around Hemel Hempstead, Hertfordshire against DEFRA's Strategic Noise Mapping (Round 4, 2022). 20% of them (504) have mapped road noise of 55 dB or more by day, and 2% have mapped rail noise. 78% of postcodes have no mapped road or rail noise at all — though that reflects major-source modelling, not guaranteed quiet. The highest modelled level we found is at HP3 9SE (road noise 70.0–74.9 dB by day).
- Where is the most road noise in Hemel Hempstead?
- The postcodes with the highest modelled daytime levels in and around Hemel Hempstead are HP3 9SE, HP2 4FL, HP3 9SB, based on DEFRA's 2022 model of major roads and railways.