SmogRank / World / Europe / France / Centre-Val de Loire

Most polluted cities in Centre-Val de Loire, France

10 measured cities, this year; 10 above the WHO annual guideline. Worst: Orléans at 8.1 µg/m³, #1,769 in the world.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

Île-de-France: 6 measured citiesCentre-Val de Loire: 10 measured citiesBourgogne-Franche-Comté: 4 measured citiesNormandy: 10 measured citiesHauts-de-France: 13 measured citiesGrand Est: 10 measured citiesPays de la LoireNew Aquitaine: 9 measured citiesAuvergne-Rhône-Alpes: 20 measured cities#10 Olivet: 6.7 µg/m³#9 Châteauroux: 6.8 µg/m³#7 Bourges: 6.9 µg/m³#8 Blois: 6.9 µg/m³#5 Tours: 7.0 µg/m³#6 Joué-lès-Tours: 7.0 µg/m³#3 Montargis: 7.6 µg/m³#4 Dreux: 7.6 µg/m³#2 Chartres: 7.8 µg/m³#1 Orléans: 8.1 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
← Chartres 1% 1%0
Every measured city in Centre-Val de Loire, France, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Chartres 1%
  2. 2Orléans 1%
  3. 3Olivetlast full day 3 Oct 0%
  4. 4Dreux 0%
  5. 5Montargis 0%
  6. 6Tours 0%
  7. 6Joué-lès-Tours 0%
  8. 8Bourges 0%
  9. 8Blois 0%
  10. 10Châteauroux 0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Centre-Val de Loire cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Vierzon≈ 5 µg/m³Good
Fleury-les-Aubrais≈ 6 µg/m³Good
Romorantin-Lanthenay≈ 5 µg/m³Good
Saint-Jean-de-Braye≈ 6 µg/m³Good
Vendôme≈ 5 µg/m³Good
Lucé≈ 6 µg/m³Good
Saint-Jean-de-la-Ruelle≈ 6 µg/m³Good
Saint-Cyr-sur-Loire≈ 5 µg/m³Good
Saran≈ 6 µg/m³Good
Saint-Avertin≈ 5 µg/m³Good
Châteaudun≈ 5 µg/m³Good
Gien≈ 5 µg/m³Good
Saint-Pierre-des-Corps≈ 5 µg/m³Good

Bad-air episodes in Centre-Val de Loire

Times when many cities around here had PM2.5 at twice their usual or more on the same days.

Use this board

SmogRank, most polluted cities in Centre-Val de Loire, France, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/fr/region/centre-val-de-loire?w=year.

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.

Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.