Kalmar vs Norrtälje AQI Comparison

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

Lower average AQI: Norrtälje (11-pt gap)PM2.5: Kalmar 7.0 ug/m3 · Norrtälje 4.3 ug/m3

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

Compare two cities

City A

City B

Kalmar vs Norrtälje

Kalmar

Kalmar, Sweden

PM2.5: 7.0 ug/m3
PM10: 12.0 ug/m3
Worst month: March
Trend: n/a

EPA category: Good

Norrtälje

Stockholm, Sweden

PM2.5: 4.3 ug/m3
PM10: 5.5 ug/m3
Worst month: March
Trend: n/a

EPA category: Good

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Kalmar

Norrtälje

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.