Bulgaria · The summary is refreshed every 15 minutes.
October 22
The air is moderate now
Sofia
15°C
Cloudy
55AQI
1017hPa
Atmospheric
pressure
87%
Humidity
Sofia, October 21, 2026: daily mean PM2.5 7 µg/m³ (256 sensors), level “Low” — as in the Atmy Data Hub. Now (21:45 local time): 11.0 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Sofia, PM2.5 averages 11.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 253 sensors on the Atmy network, readings from 21:07–21:42 local time (18:07–18:42 UTC), summary prepared at 21:45 local time. Median: 9.1 µg/m³; range across sensors: 0.2–200.7 µg/m³.
In Sofia the air is moderate right now (approximate, US EPA scale). From 09:00 to 21:45 local time the city mean PM2.5 fell from 16.9 to 11.0 µg/m³.
Light wind (1 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion). High humidity (87%) possibly makes optical sensors read somewhat higher.
Weather now: cloudy, 15°C, wind 1 m/s, humidity 87%. By 04:00 the wind is expected to pick up to 4 m/s, which may clear the air. Precipitation is expected around 05:00; it may wash particles out. By 09:00 the temperature will be about 11°C.
Written automatically at 21:45 local time (18:45 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
4 km/h
Wind, ENE
0.8 mm
Precipitation today
7 µg/m³ Low
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 7 µg/m³ from 256 sensors that passed the quality check — the same value as in the Atmy Data Hub.
Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.
23%An estimate of weather conditions · not a PM2.5 forecast
20°/11°
Index by time of day
54/100Moderate
Night
Morning
Day
Evening15°/8°
Index by time of day
42/100Moderate
NightMorningDayEvening18°/3°
Index by time of day
62/100Moderate
NightMorningDayEvening16°/10°
Index by time of day
52/100Moderate
NightMorningDayEvening15°/8°
Index by time of day
57/100Moderate
NightMorningDayEvening14°/3°
Index by time of day
55/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
15°
Cloudy. Feels like 16°C
12°C88%
20°C59%
15°C89%4km/hWind from the ENE
11km/hWind gusts
Wind force: 1
Light wind is expected over the next few hours.
Bulgaria
20°C11°C15°C8°C
18°C3°C16°C10°C15°C8°C
14°C3°C14°C-2°C14°C1°C12°C7°C13°C6°C
Highest current reading: 200.7 µg/m³ (SC #38283). Lowest: 0.2 µg/m³ (SC #77287). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: Sensor.Community — 253 sensors.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
475
SofiaBulgaria
253PlovdivBulgaria
42VarnaBulgaria
25Cities with the most sensors
All sensors on the map, by city as the map assigns them; the city’s values count only the sensors that pass the Data Hub’s quality check.
Daily mean PM2.5 of the city sensors, µg/m³
Click a day to see its date and value.
A card with the current PM2.5 in Sofia: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
Bulgaria · City ranking · All pilot cities
Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 7 µg/m³ from 256 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 18 of 20 cities in Bulgaria and No. 194 of 297 worldwide, from the most polluted.
Right now in Sofia, PM2.5 averages 11.0 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 253 sensors on the Atmy network, readings from 21:07–21:42 local time (18:07–18:42 UTC), summary prepared at 21:45 local time. Median: 9.1 µg/m³; range across sensors: 0.2–200.7 µg/m³.
The current level is “moderate” (US EPA scale, approximate). Unusually sensitive people should consider reducing prolonged or heavy exertion outdoors. This is the standard guidance of the scale, not medical advice.
Highest current reading: 200.7 µg/m³ (SC #38283). Lowest: 0.2 µg/m³ (SC #77287). The list shows every sensor, highest first.
From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.
The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.
Over the last 365 days with data, the mean daily PM2.5 in Sofia was 6.9 µg/m³ — 1.4 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 6.3 µg/m³. From Atmy's archive of daily city means.
In Atmy's daily archive, the cleanest month of the last year was May 2026: 4.1 µg/m³ on average.
The most polluted month of the last year was December 2025: 11.9 µg/m³ on average.
From November to March the mean daily PM2.5 was 9.3 µg/m³, from June to August 5.2 µg/m³ (last 365 days).
The daily value is the Data Hub’s: the mean of the city’s sensors that passed the nightly quality check, each with at least 12 valid hours, and only with sensors at four places 500 m apart; days are UTC.
“Now” uses the same sensors and rule: the mean of their latest readings, each at most 60 minutes old, shown only with sensors at four places 500 m apart reporting.
Source: public Atmy monitoring data. Methodology and data sources · Data terms
