Sofia vs Veliko Tarnovo AQI Comparison

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

Lower average AQI: Sofia (66-pt gap)PM2.5: Sofia 48.1 ug/m3 · Veliko Tarnovo 33.0 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-01–2024-12-31 and 2024-10-14–2024-12-31.

Compare two cities

City A

City B

Sofia vs Veliko Tarnovo

Sofia

Sofia-Grad, Bulgaria

PM2.5: 48.1 ug/m3
PM10: 27.6 ug/m3
Worst month: December
Trend: n/a

EPA category: Good

Veliko Tarnovo

Veliko Tarnovo, Bulgaria

PM2.5: 33.0 ug/m3
PM10: 37.0 ug/m3
Worst month: December
Trend: n/a

EPA category: Moderate

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

Yearly EPA AQI trend

Seasonal EPA AQI heatmap

JanFebMarAprMayJunJulAugSepOctNovDec

Sofia

101

Veliko Tarnovo

100

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.