Road & rail noise map for Diss
Town in Norfolk, Eastern
We analysed 560 postcodes in and around Diss, Norfolk against DEFRA's Strategic Noise Mapping (Round 4, 2022). 20% of them (113) have mapped road noise of 55 dB or more by day, and 1% have mapped rail noise. 79% 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 IP22 4HZ (road noise 65.0–69.9 dB by day).
Noise map of Diss
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 | 15% (85) | 5% (26) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 4% (22) | 3% (17) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 1% (6) | <1% (3) |
| 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 | 80% | 92% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | <1% (2) | <1% (2) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | <1% (4) | <1% (4) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 0% (0) | 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 | 99% | 99% |
Share of the 560 postcodes within ~5 km of the Diss centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Diss
Check a specific postcode
Example searches: IP22 4JN · IP21 4HH · IP22 1AZ · IP22 4HZ · IP21 4AJ · IP23 8AA
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 Diss?
- We analysed 560 postcodes in and around Diss, Norfolk against DEFRA's Strategic Noise Mapping (Round 4, 2022). 20% of them (113) have mapped road noise of 55 dB or more by day, and 1% have mapped rail noise. 79% 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 IP22 4HZ (road noise 65.0–69.9 dB by day).
- Where is the most road noise in Diss?
- The postcodes with the highest modelled daytime levels in and around Diss are IP22 4HZ, IP23 8AA, IP22 1AZ, based on DEFRA's 2022 model of major roads and railways.