Aalborg vs Silkeborg AQI Comparison

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

Lower average AQI: Silkeborg (16-pt gap)PM2.5: Aalborg 12.1 ug/m3 · Silkeborg 6.2 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-09-19–2024-12-31 and 2024-12-09–2024-12-31.

Compare two cities

City A

City B

Aalborg vs Silkeborg

Aalborg

Nordjylland, Denmark

PM2.5: 12.1 ug/m3
PM10: 13.2 ug/m3
Worst month: September
Trend: n/a

EPA category: Good

Silkeborg

Midtjylland, Denmark

PM2.5: 6.2 ug/m3
PM10: 6.8 ug/m3
Worst month: December
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Aalborg

Silkeborg

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.