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Air quality — NO₂ in Hertfordshire
Hertfordshire’s 10 areas ranked — cleanest air. Every figure from DEFRA air quality + EA Flood Map for Planning, 2023–24. Indicative, not a valuation.
| # | Area | Air quality — NO₂ (µg/m³) |
|---|---|---|
| 1 | North Hertfordshire | 8.4 |
| 2 | East Hertfordshire | 8.5 |
| 3 | Dacorum | 9.3 |
| 4 | Stevenage | 10.7 |
| 5 | St Albans | 10.8 |
| 6 | Welwyn Hatfield | 11.1 |
| 7 | Three Rivers | 11.3 |
| 8 | Broxbourne | 11.5 |
| 9 | Hertsmere | 12.4 |
| 10 | Watford | 12.8 |
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)Life expectancy — womenLife expectancy — menAir quality — PM2.5Flood risk (in a flood zone)Life satisfactionUnemployment rateHome ownershipDegree-level educationResidents in good healthMedian age