SmogRank / World / France / Centre-Val de Loire / 2025

Most polluted cities in Centre-Val de Loire, France, 2025

4 cities in Centre-Val de Loire, France ranked by their average PM2.5 over the 365 days; 4 above the WHO annual guideline (5.0 µg/m³). Worst: Chartres at 8.7 µg/m³, #1,444 of 2,624 cities in the world. Cleanest: Montargis at 7.6. A city needs measurements on 70% of the days to be ranked.

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.

← Chartres 0% 0.75%0
Every city in Centre-Val de Loire, France ranked for 2025, 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
    0%
  2. 2Joué-lès-Tours
    0%
  3. 2Blois
    0%
  4. 4Montargis
    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

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SmogRank, most polluted cities in Centre-Val de Loire, France, PM2.5, 2025, smogrank.com/fr/region/centre-val-de-loire/history/2025 (accessed 6 Oct 2026).

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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.