airy.earth

Sofia air quality

Bulgaria · Live AQI and hourly forecast for the next 5 days · updated Sun 02:00 local time

41

Good

US AQI, mostly PM2.5

Great air. A perfect time to be outside.

Next 24 hours
29–41US AQI, highest around Sun 02:00
Best time outside
Sun 13:00–16:00US AQI about 29
PM2.5 vs WHO guideline
0.4×5.5 µg/m³ over 24 h, guideline 15
Cigarette equivalent
≈ 0.3 a dayBerkeley Earth rule of thumb
European AQI
Fairlevel 2 of 6

Loading the live globe…

The live globe, centred on Sofia. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Sofia right now

PollutantNowNext 24 h vs WHOUS AQI band
Fine particles (PM2.5) 5.1 µg/m³ 0.4× Good
Coarse particles (PM10) 7.0 µg/m³ 0.2× Good
Nitrogen dioxide (NO2) 5.8 µg/m³ 0.1× Good
Ozone (O3) 45 µg/m³ 0.7× Good
Sulphur dioxide (SO2) 1.2 µg/m³ 0.0× Good
Carbon monoxide (CO) 170 µg/m³ 0.0× Good
Desert dust0 µg/m³
Smoke and haze (aerosol optical depth)0.10
UV index0.0

“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.

Next 48 hours

Hourly US AQI. Highest 48 around Tue 00:00, lowest 29 around Sun 14:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Sofia

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.

DayUS AQIAt worstWorst hourPM2.5 avgUV max
Sun 27 Sept 29–43 Good 0:00 5.1 3.6
Mon 28 Sept 30–47 Good 23:00 8.6 3.6
Tue 29 Sept 48–54 Moderate 16:00 11 4.1
Wed 30 Sept 47–53 Moderate 0:00 8.1 3.2
Thu 1 Oct 31–45 Good 0:00 5.8 3.0

Common questions about the air in Sofia

  1. Is the air in Sofia safe today?

    Yes. Right now the US AQI in Sofia is 41, which counts as good. Great air. A perfect time to be outside.

  2. When is the best time to be outside in Sofia?

    Sun 13:00–16:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 29. The worst hour is around Sun 02:00, at 41.

  3. What is the main pollutant in Sofia?

    Fine particles (PM2.5). It drives the index right now, at 5.1 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

  4. How does Sofia's air compare with the WHO guideline?

    Within the guideline. Over the next 24 hours PM2.5 averages about 5.5 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.

  5. How many cigarettes is a day of Sofia's air?

    About 0.3 cigarettes. Over the next 24 hours PM2.5 averages about 5.5 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

  6. Will air quality in Sofia improve this week?

    Today looks cleanest. Its AQI peaks at 43, against 54 on Tuesday, the worst day in the forecast.

Measured near Sofia

StationDistancePM2.5 µg/m³Measured
Unnamed sensor Sensor.Community, low-cost sensor 0.7 km 2.8 Sun 02:48
Unnamed sensor Sensor.Community, low-cost sensor 0.7 km 1.1 Sun 02:49
Unnamed sensor Sensor.Community, low-cost sensor 0.8 km 2.6 Sun 02:48

Air quality near Sofia

All 161 cities

About this forecast

Forecast from CAMS Europe and global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 42.70°N, 23.32°E, updated 2026-09-26 23:00 UTC.