Sofia vs Svishtov AQI Comparison

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

Lower average AQI: Sofia (131-pt gap)PM2.5: Sofia 48.1 ug/m3 · Svishtov 107.7 ug/m3

Source: OpenAQ local exports mapped to AQI Now cities; city summaries cover 2024-01-01–2024-12-31 and 2023-12-31–2024-12-31.

Compare two cities

City A

City B

Sofia vs Svishtov

Sofia

Sofia-Grad, Bulgaria

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

EPA category: Good

Svishtov

Veliko Tarnovo, Bulgaria

162

PM2.5: 107.7 ug/m3
PM10: 106.7 ug/m3
Worst month: December
Trend: n/a

EPA category: Unhealthy

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

Svishtov

214

133

100

258

181

169

268

372

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.