Road & rail noise map for Chelmsford
City in Essex, Eastern
We analysed 2,791 postcodes in and around Chelmsford, Essex against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (789) have mapped road noise of 55 dB or more by day, and <1% have mapped rail noise. 71% 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 CM2 5AE (road noise 75.0 dB or more by day).
Noise map of Chelmsford
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% (415) | 12% (321) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | 11% (309) | 4% (123) |
| 65.0–69.9 dB day · 60.0–64.9 dB night | 2% (55) | 1% (33) |
| 70.0–74.9 dB day · 65.0–69.9 dB night | <1% (9) | <1% (4) |
| 75.0 dB or more day · 70.0 dB or more night | <1% (1) | <1% (1) |
| Below mapped bands / not mapped | 72% | 83% |
Rail noise
| Band | Day (LAeq,16h) | Night (Lnight) |
|---|---|---|
| 55.0–59.9 dB day · 50.0–54.9 dB night | <1% (23) | <1% (21) |
| 60.0–64.9 dB day · 55.0–59.9 dB night | <1% (3) | <1% (1) |
| 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 2,791 postcodes within ~5 km of the Chelmsford centre. Source: DEFRA Strategic Noise Mapping Round 4 (2022), Open Government Licence.
Noisiest postcodes in and around Chelmsford
Check a specific postcode
Example searches: CM2 5AE · CM2 0XQ · CM1 2XJ · CM2 0HU · CM2 0PW · CM2 0NF
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 Chelmsford?
- We analysed 2,791 postcodes in and around Chelmsford, Essex against DEFRA's Strategic Noise Mapping (Round 4, 2022). 28% of them (789) have mapped road noise of 55 dB or more by day, and <1% have mapped rail noise. 71% 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 CM2 5AE (road noise 75.0 dB or more by day).
- Where is the most road noise in Chelmsford?
- The postcodes with the highest modelled daytime levels in and around Chelmsford are CM2 5AE, CM2 0PW, CM2 0NF, based on DEFRA's 2022 model of major roads and railways.