Poland · The summary is refreshed every 15 minutes.
November 11
The air is moderate now
Measured 21:00–22:57
Siemianowice Śląskie
5°C
Cloudy
1005
hPaAtmospheric
pressure
92%
Humidity
Siemianowice Śląskie, November 10, 2026: daily mean PM2.5 28 µg/m³ (5 sensors), level “Moderate” — as in the Atmy Data Hub. Now (23:00 local time): 23.3 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON
Right now in Siemianowice Śląskie, PM2.5 averages 23.3 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors from Sensor.Community, Government stations, readings from 21:00–22:57 local time (20:00–21:57 UTC), summary prepared at 23:00 local time. Median: 23.0 µg/m³; range across sensors: 7.1–38.0 µg/m³.
In Siemianowice Śląskie the air is moderate 🟡 AQI 77. About the same as three hours ago. ☁️ +5 °C · No precipitation · Wind 3 m/s
In Siemianowice Śląskie the air is moderate right now (approximate, US EPA scale). From 10:00 to 23:00 local time the city mean PM2.5 rose from 11.6 to 23.3 µg/m³. The highest hour was 17:00 with 28.6 µg/m³.
Cold weather (5°C) possibly means more heating, a common source of particles. High humidity (92%) possibly makes optical sensors read somewhat higher.
Weather now: cloudy, 5°C, wind 3 m/s, humidity 92%. By 09:00 the wind is expected to pick up to 5 m/s, which may clear the air.
Written automatically at 23:00 local time (22:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
3 m/s
Wind, SSE
1.3 mm
Precipitation today
28 µg/m³ Moderate
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 28 µg/m³ from 5 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.
18/100Low · An estimate of weather conditions · not a PM2.5 forecast
6°/2°
Index by time of day
52/100Moderate
Night
Morning
Day
Evening10°/5°
Index by time of day
48/100Moderate
NightMorningDayEvening8°/3°
Index by time of day
38/100Moderate
NightMorningDayEvening6°/1°
Index by time of day
39/100Moderate
NightMorningDayEvening8°/-1°
Index by time of day
54/100Moderate
NightMorningDayEvening10°/4°
Index by time of day
47/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
5°
Cloudy. Feels like 2°C
3°C82%6°C70%5°C92%3m/sWind from the SSE
6m/sWind gusts
Wind force: 2
Gusts up to 6 m/s are expected.
Poland
6°C2°C10°C5°C
8°C3°C6°C1°C
8°C-1°C10°C4°C9°C3°C10°C3°C8°C6°C9°C4°C
Highest current reading: 38.0 µg/m³ (SC #93792). Lowest: 7.1 µg/m³ (SC #40981). The list shows every sensor, highest first.
Source: atmy.ai monitoring network
Sensors in the summary by network: Sensor.Community — 4 sensors, Government stations — 1 sensor.
Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.
701
WarsawPoland
113WrocławPoland
80PoznanPoland
54Cities 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.
An Atmy card with the air quality in Siemianowice Śląskie now: it is refreshed every 15 minutes and links to this page. Paste the code into your site.
Poland · City ranking · All pilot cities
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 28 µg/m³ from 5 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 21 of 40 cities in Poland and No. 194 of 676 worldwide, from the most polluted.
Right now in Siemianowice Śląskie, PM2.5 averages 23.3 µg/m³ — “moderate” on the US EPA scale (approximate, from hourly readings). Mean of 5 sensors from Sensor.Community, Government stations, readings from 21:00–22:57 local time (20:00–21:57 UTC), summary prepared at 23:00 local time. Median: 23.0 µg/m³; range across sensors: 7.1–38.0 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: 38.0 µg/m³ (SC #93792). Lowest: 7.1 µg/m³ (SC #40981). 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.
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
