Methodology
Livioo calculates a livability index for every address in Sofia from 0 to 100. The score is a weighted average of six dimensions — each based on open, objective data. No dimension is subjective and none factors in property prices.
Composite score
How the final index is formed
The overall index is a weighted average of six dimensions. Each dimension receives a score from 0 to 100 based on objective geographic and transit data. The distribution has a mean of ~58 and standard deviation of ~16 — about 10% of Sofia reaches "Exceptional" (≥ 80), while about 10% falls into "Below average" (< 40).
Dimensions
Transit
Real departure frequency, transit type, distance to stops, and network density around the address. Data from the official Sofia GTFS feed.
Green Space
Proximity to a large green area, local greenery within 300 m and 1 km, and actual green cover from satellite data.
School Access
Physical proximity to primary and secondary schools, variety of options, and quality measured by NVO and DZI exam results within 5 km.
Healthcare
Proximity and density of outpatient facilities (higher weight) and distance to a hospital with an emergency department (lower weight).
Amenities
Proximity to grocery stores, pharmacies, banks, post offices, cafes, and restaurants from OpenStreetMap; fallback from atlas commercial indicators per planning unit.
Air Quality
Annual average PM2.5 level, interpolated from a citizen sensor network (Sensor.Community). Winter months receive higher weight due to temperature inversions in the Sofia basin.
Data sources
- •OpenStreetMap — commercial and service points (amenities), healthcare, education
- •Sensor.Community — citizen PM2.5 sensors (SDS011) for air quality
- •Sofia Urban Mobility Center — GTFS data for public transit
- •Ministry of Education — school and kindergarten registry
- •NHIF — healthcare facility locations
- •Aggregated NVO and DZI results (publicly available)
What we do not measure
The index measures objective characteristics of the physical environment. It does not account for subjective factors such as noise, safety, social composition, or building quality. Results are indicative and do not replace a personal inspection of the location.
Data as of April 2026. Livability analysis for Sofia.