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Cleanest air for fine particles in Hertfordshire
Hertfordshire’s 10 areas ranked by air quality — pm2.5 — cleanest air. Every figure from DEFRA air quality + EA Flood Map for Planning, 2023–24. Indicative, not a valuation.
| # | Area | Air quality — PM2.5 (µg/m³) |
|---|---|---|
| 1 | East Hertfordshire | 7.0 |
| 2 | North Hertfordshire | 7.1 |
| 3 | Stevenage | 7.1 |
| 4 | Dacorum | 7.2 |
| 5 | Welwyn Hatfield | 7.4 |
| 6 | St Albans | 7.4 |
| 7 | Broxbourne | 7.4 |
| 8 | Three Rivers | 7.5 |
| 9 | Hertsmere | 7.7 |
| 10 | Watford | 7.8 |
Source: DEFRA air quality + EA Flood Map for Planning · 2023–24. Ranked lowest first.
Other Hertfordshire rankings
House prices5-year house-price growthPrice per square metreAffordability (price vs local earnings)Crime rateSchools rated Good or OutstandingGigabit broadband availabilityFastest train to the cityCouncil tax (Band D)Deprivation (IMD decile, 10 = least deprived)Air quality — NO₂Flood risk (in a flood zone)Life satisfactionUnemployment rateHome ownershipDegree-level educationResidents in good healthMedian age