Aarau vs Ostermundigen AQI Comparison

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

Lower average AQI: Ostermundigen (46-pt gap)PM2.5: Aarau 17.8 ug/m3 · Ostermundigen 12.0 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-07-22–2024-12-31 and 2024-01-29–2024-12-31.

Compare two cities

City A

City B

Aarau vs Ostermundigen

Aarau

Aargau, Switzerland

PM2.5: 17.8 ug/m3
PM10: 19.0 ug/m3
Worst month: December
Trend: n/a

EPA category: Moderate

Ostermundigen

Bern, Switzerland

PM2.5: 12.0 ug/m3
PM10: 11.2 ug/m3
Worst month: December
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Aarau

Ostermundigen

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.