Katowice vs Wejherowo AQI Comparison

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

Lower average AQI: Katowice (6-pt gap)PM2.5: Katowice 23.3 ug/m3 · Wejherowo 27.1 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-03–2024-12-31 and 2024-09-03–2024-09-25.

Compare two cities

City A

City B

Katowice vs Wejherowo

Katowice

Śląskie, Poland

PM2.5: 23.3 ug/m3
PM10: 34.9 ug/m3
Worst month: December
Trend: n/a

EPA category: Moderate

Wejherowo

Pomorskie, Poland

PM2.5: 27.1 ug/m3
PM10: 30.5 ug/m3
Worst month: September
Trend: n/a

EPA category: Moderate

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Katowice

Wejherowo

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.