Bucharest vs Dej AQI Comparison

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

Lower average AQI: Bucharest (48-pt gap)PM2.5: Bucharest 46.8 ug/m3 · Dej 22.8 ug/m3

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

Compare two cities

City A

City B

Bucharest vs Dej

Bucharest

Bucharest-Ilfov, Romania

PM2.5: 46.8 ug/m3
PM10: 24.5 ug/m3
Worst month: December
Trend: n/a

EPA category: Good

Dej

Cluj, Romania

PM2.5: 22.8 ug/m3
PM10: 28.6 ug/m3
Worst month: February
Trend: n/a

EPA category: Moderate

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Bucharest

Dej

111

116

112

113

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.