Grigny vs Sarzeau AQI Comparison

Side-by-side OpenAQ-derived air quality comparison for Grigny and Sarzeau. Values use mapped daily PM2.5 and PM10 observations normalized to US EPA AQI.

Lower average AQI: Sarzeau (69-pt gap)PM2.5: Grigny 19.9 ug/m3 · Sarzeau 0.0 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-02–2024-02-07 and 2024-05-31–2024-12-26.

Compare two cities

City A

City B

Grigny vs Sarzeau

Grigny

Auvergne-Rhone-Alpes, France

PM2.5: 19.9 ug/m3
PM10: 23.3 ug/m3
Worst month: January
Trend: n/a

EPA category: Moderate

Sarzeau

Bretagne, France

PM2.5: 0.0 ug/m3
PM10: n/a ug/m3
Worst month: October
Trend: n/a

EPA category: Good

Lower average AQI in this selected period: Sarzeau. Values are historical OpenAQ-derived city summaries, not live readings.

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Grigny

Sarzeau

What this comparison measures

Average EPA AQI — city-level daily AQI values averaged across the OpenAQ coverage window.
PM2.5 and PM10 — mapped monitor concentrations aggregated to daily city averages.
Seasonality — worst and cleanest months from the monthly city rollups.
Trend — difference between the earliest and latest yearly AQI average in this build.