France · The summary is refreshed every 15 minutes.
No current value: fewer than four sensors at different places are reporting now.
Argenteuil, October 23, 2026: daily mean PM2.5 0 µg/m³ (4 sensors), level “Low” — as in the Atmy Data Hub. Open methodology and data in JSON: Methodology and data sources · JSON
There are not enough fresh measurements for Argenteuil right now. From 18:00 to 05:00 local time the city mean PM2.5 stayed roughly level: from 0.8 to 0.0 µg/m³.
The weather data do not point to a clear reason for this level.
Weather now: rain, 9°C, wind 4 m/s, humidity 80%. Precipitation is expected around 10:00; it may wash particles out. By 18:00 the temperature will be about 12°C.
Written automatically at 06:07 local time (04:07 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.
14 km/h
Wind, WSW
5.1 mm
Precipitation today
0 µg/m³ Low
Daily mean PM2.5 on October 23, 2026 (00:00–24:00 UTC): 0 µg/m³ from 4 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.
29%An estimate of weather conditions · not a PM2.5 forecast
13°/9°
Index by time of day
36/100Moderate
Night
Morning
Day
Evening17°/10°
Index by time of day
24/100Low
NightMorningDayEvening15°/9°
Index by time of day
50/100Moderate
NightMorningDayEvening18°/11°
Index by time of day
45/100Moderate
NightMorningDayEvening15°/7°
Index by time of day
58/100Moderate
NightMorningDayEvening15°/6°
Index by time of day
57/100Moderate
NightMorningDayEveningForecast of conditions that trap pollution near the surface
9°
Rain. Feels like 6°C
10°C83%
12°C72%12°C86%14km/hWind from the WSW
32km/hWind gusts
Wind force: 3
Gusts up to 32 km/h are expected.
France
13°C9°C17°C10°C15°C9°C18°C11°C15°C7°C
15°C6°C14°C6°C
10°C7°C12°C7°C
11°C3°C197
RennesFrance
24StrasbourgFrance
19ToulouseFrance
15Cities 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 October 23, 2026 (00:00–24:00 UTC): 0 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 17 of 17 cities in France and No. 295 of 295 worldwide, from the most polluted.
Fresh data for Argenteuil are insufficient (last update: 05:45 local time, 03:45 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.
Over the last 286 days with data, the mean daily PM2.5 in Argenteuil was 6.3 µg/m³ — 1.3 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 5.3 µg/m³. From Atmy's archive of daily city means.
In Atmy's daily archive, the cleanest month of the last year was August 2026: 3.2 µg/m³ on average.
The most polluted month of the last year was March 2026: 11.7 µg/m³ on average.
From November to March the mean daily PM2.5 was 8.8 µg/m³, from June to August 3.8 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
