Climate
Plovdiv logs 76 hot days a year to Sliven's 23 — Sliven wins by 53. Plovdiv also leads on outdoor-dinner months by 1.
Plovdiv
Feels-like °C
Dinner outside
Sliven
Feels-like °C
Dinner outside
Air Quality
Plovdiv averages 17.5 µg/m³ (sensitive-groups) PM2.5 annually versus Sliven's 15.7 µg/m³ (sensitive-groups) — Sliven breathes ~10% cleaner air (1.8 µg/m³ lower).
Plovdiv
Sliven
PM2.5 annual average
WHO classification
City Scale
Both maps at the same real-world scale — 1 cm on either map is the same distance.
Plovdiv (332K) and Sliven (84K) are 4.0x in population — Plovdiv is the larger metro, Sliven the smaller.
Plovdiv is roughly 4.0x the scale of Sliven
Based on population (area data unavailable for some cities)
PlovdivSlivenCity Scale Rankings
Plovdiv332K4.0xSliven84K1xWho Thrives Here
Both cities work well for the clean air seeker.
Also compared
Sofia Frequently asked about Plovdiv vs Sliven
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