France · The summary is refreshed every 15 minutes.
No current value: fewer than four sensors at different places are reporting now.
Nantes, November 10, 2026: daily mean PM2.5 7 µg/m³ (11 sensors), level “Low” — as in the Atmy Data Hub. Open methodology and data in JSON: Methodology and data sources · JSON
In Nantes the air is moderate right now (approximate, US EPA scale). From 10:00 to 20:00 local time the city mean PM2.5 rose from 7.5 to 13.0 µg/m³.
Light wind (2 m/s) in the evening or at night, as the air cools, possibly traps particles near the ground (a temperature inversion). High humidity (94%) possibly makes optical sensors read somewhat higher.
Weather now: cloudy, 13°C, wind 2 m/s, humidity 94%. By 06:00 the wind is expected to pick up to 4 m/s, which may clear the air.
Written automatically at 22:08 local time (21:08 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
2 m/s
Wind, E
0 mm
Precipitation today
7 µg/m³ Low
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 7 µg/m³ from 11 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.
19/100Low · An estimate of weather conditions · not a PM2.5 forecast
18°/10°
Index by time of day
51/100Moderate
Night
Morning
Day
Evening13°/9°
Index by time of day
35/100Moderate
NightMorningDayEvening12°/6°
Index by time of day
38/100Moderate
NightMorningDayEvening11°/4°
Index by time of day
46/100Moderate
NightMorningDayEvening16°/9°
Index by time of day
48/100Moderate
NightMorningDayEvening12°/7°
Index by time of day
28/100Low
NightMorningDayEveningForecast of conditions that trap pollution near the surface
13°
Cloudy. Feels like 14°C
11°C97%17°C84%14°C91%2m/sWind from the E
3m/sWind gusts
Wind force: 2
Gusts up to 7 m/s are expected.
France
18°C10°C13°C9°C12°C6°C11°C4°C
16°C9°C
12°C7°C12°C6°C14°C10°C13°C10°C
12°C7°C207
RennesFrance
20ToulouseFrance
18VilleurbanneFrance
16Cities 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.
France · City ranking · All pilot cities
Daily mean PM2.5 on November 10, 2026 (00:00–24:00 UTC = 01:00–01:00 UTC+1): 7 µg/m³ from 11 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 25 of 32 cities in France and No. 589 of 676 worldwide, from the most polluted.
Fresh data for Nantes are insufficient (last update: 13:45 local time, 12:45 UTC). Open the map for the latest readings of individual sensors.
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
