---
entity_id: city:fr:insee5:44162
entity_type: city
name: Saint-Herblain
country_code: FR
country: France
slug: saint-herblain
canonical_url: https://immigrationdb.com/cities/fr/saint-herblain/
json_url: https://immigrationdb.com/data/cities/fr/saint-herblain.json
markdown_url: https://immigrationdb.com/data/cities/fr/saint-herblain.md
mcp_uri: immigrationdb://city/fr/saint-herblain
snapshot_id: approved-static-bb6d69cd3c074ae2
generated_at: 2026-08-04
last_verified: 2026-07-31
fact_count: 15
metric_dictionary_url: https://immigrationdb.com/data/metrics.json
license_url: https://immigrationdb.com/about/copyright/
---

# Saint-Herblain

Saint-Herblain is a city in France. Annual PM2.5 was 8.17 µg/m³ in 2024. Annual PM10 was 14.2 µg/m³ in 2024. The unemployment rate was 11.3% at the end of 2022. Annual NO₂ was 14 µg/m³ in 2024. The foreign population count was 4,695 in 2021. At the start of 2024, Saint-Herblain had a population of 50,973.

## Population

The city covered 30 km² in 2022. Population density was 1,684.2 people per km² in 2022.

## Facts

| Metric | metric_id | Value | Scope | Observed | Verified | Freshness | Lane | Source |
| --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Foreign residents | `foreign_population_total` | 4,695 people | city | 2021 | 2026-07-15 | stale | verified | [1] |
| Population | `population_total` | 50,973 people | municipality | 2025-01-01 | 2026-07-14 | aging | verified | [2] |
| NO₂ — latest reading | `air_quality_no2_current_ug_m3` | 19.275 µg/m³ | city | 2026-07-15 | 2026-07-15 | fresh | verified | [3] |
| Gigabit broadband availability | `broadband_gigabit_availability_percent` | 97.99 % | city | 2026-03-31 | 2026-07-15 | fresh | verified | [4] |
| Unemployment rate | `unemployment_total_percent` | 11.2927 % | city | 2022-12-31 | 2026-07-26 | stale | verified | [5] |
| NO₂ — annual mean | `air_quality_no2_annual_ug_m3` | 13.9887 µg/m³ | city | 2024 | 2026-07-15 | stale | verified | [6] |
| PM10 — annual mean | `air_quality_pm10_annual_ug_m3` | 14.2297 µg/m³ | city | 2024 | 2026-07-15 | stale | verified | [6] |
| PM2.5 — annual mean | `air_quality_pm25_annual_ug_m3` | 8.1698 µg/m³ | city | 2024 | 2026-07-15 | stale | verified | [6] |
| Average daytime high by month | `climate_monthly_high_c` | Jan 9.3 · Feb 10.5 · Mar 13.5 · Apr 16.2 · May 19.6 · Jun 23 · Jul 25.1 · Aug 25.4 · Sep 22.4 · Oct 17.6 · Nov 12.9 · Dec 9.8 °C | nearest_station | 1991-12-31 | 2026-07-31 | stale | verified | [7] |
| Average night-time low by month | `climate_monthly_low_c` | Jan 3.4 · Feb 3 · Mar 4.9 · Apr 6.6 · May 9.8 · Jun 12.7 · Jul 14.3 · Aug 14.2 · Sep 11.8 · Oct 9.5 · Nov 5.9 · Dec 3.7 °C | nearest_station | 1991-12-31 | 2026-07-31 | stale | verified | [7] |
| Average temperature by month | `climate_monthly_mean_c` | Jan 6.4 · Feb 6.7 · Mar 9.2 · Apr 11.4 · May 14.7 · Jun 17.8 · Jul 19.7 · Aug 19.8 · Sep 17.1 · Oct 13.5 · Nov 9.4 · Dec 6.7 °C | nearest_station | 1991-12-31 | 2026-07-31 | stale | verified | [7] |
| Average precipitation by month | `climate_monthly_precip_mm` | Jan 87.9 · Feb 67.5 · Mar 58.4 · Apr 58.3 · May 61 · Jun 48.5 · Jul 44.2 · Aug 50.3 · Sep 59.5 · Oct 88.8 · Nov 94.1 · Dec 101 mm | nearest_station | 1991-12-31 | 2026-07-31 | stale | verified | [7] |
| Average sunshine by month | `climate_monthly_sunshine_h` | Jan 72 · Feb 102 · Mar 147 · Apr 182 · May 203 · Jun 213 · Jul 229 · Aug 232 · Sep 198 · Oct 122 · Nov 91 · Dec 77 hours | nearest_station | 1991-12-31 | 2026-07-31 | stale | verified | [7] |
| City area | `city_area_km2` | 30.02 km2 | place | 2022-01-01 | 2026-07-14 | stale | verified | [8] |
| Population density | `population_density_per_km2` | 1,684.2438 people/km² | place | 2022-01-01 | 2026-07-14 | stale | verified | [8] |

Every row keeps the value, unit, geographic scope, observation date, verification date and the numbered source below. A missing metric means the city does not publish it; nothing is imputed.

## Sources

1. Nationalité en 2021 — Base des tableaux détaillés — NAT1 — Official source — https://www.insee.fr/fr/statistiques/fichier/8202752/TD_NAT1_2021_csv.zip
2. France official denominator source — Official source — https://www.insee.fr/fr/statistiques/fichier/8680726/ensemble.zip
3. Latest valid NO2 hourly station observation on the official LCSQA E2 current-day extract, mapped to the exact INSEE centre through an exact normalized station-name crosswalk to EEA station metadata. — Official source — https://files.data.gouv.fr/ineris/lcsqa/concentrations-de-polluants-atmospheriques-reglementes/temps-reel/2026/FR_E2_2026-07-15.csv
4. Independent ARCEP municipal count of premises eligible for the >=1 Gbit/s fixed advertised-speed class, divided by the ARCEP type=all municipal premises denominator. This is availability/eligibility, not adoption, measured speed, FTTH-only coverage or mobile coverage. — Official source — https://data.arcep.fr/fixe/maconnexioninternet/statistiques/2026_T1/commune/commune_debit.csv
5. INSEE RP2022 ACT1 — population active by type of activity, commune — Official source — https://www.insee.fr/fr/statistiques/fichier/8581605/TD_ACT1_2022_csv.zip
6. 2024 validated hourly NO2 station observations transformed to the exact INSEE commune centre by deterministic nearest-station selection and equal-weight aggregation. — Official source — https://air.discomap.eea.europa.eu/arcgis/rest/services/AirQuality/AirQualityDownloadServiceEUMonitoringStations/MapServer
7. WMO Climatological Normals 1991-2020 — station NANTES-BOUGUENAIS — Official source — https://www.ncei.noaa.gov/data/oceans/archive/arc0216/0253808/1.1/data/0-data/Region-6-WMO-Normals-9120/France/CSV/NANTES_BOUGUENAIS_07222.csv
8. A-ccepted source for city area and derived population density — Official source — https://www.insee.fr/fr/statistiques/fichier/2521169/base_cc_comparateur_csv.zip

## Cite

ImmigrationDB. "Saint-Herblain, France." Snapshot approved-static-bb6d69cd3c074ae2, last verified 2026-07-31. https://immigrationdb.com/cities/fr/saint-herblain/

Reuse requires the direct source URL, the observation date and a link back to the ImmigrationDB page: https://immigrationdb.com/about/copyright/

## Data

- HTML: https://immigrationdb.com/cities/fr/saint-herblain/
- JSON: https://immigrationdb.com/data/cities/fr/saint-herblain.json
- Markdown: https://immigrationdb.com/data/cities/fr/saint-herblain.md
- MCP resource: immigrationdb://city/fr/saint-herblain
- Metric dictionary: https://immigrationdb.com/data/metrics.json
- All published city facts, one row each: https://immigrationdb.com/data/facts.ndjson.gz
- Release catalog: https://immigrationdb.com/data/catalog.json