Lyon air quality now

France · The summary is refreshed every 15 minutes.

October 22

The air is clean now

Lyon

15°C

Cloudy

11AQI

1021hPa

Atmospheric
pressure

55%

Humidity

Lyon, October 21, 2026: daily mean PM2.5 3 µg/m³ (4 sensors), level “Low” — as in the Atmy Data Hub. Now (20:00 local time): 2.0 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in Lyon, PM2.5 averages 2.0 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 19:55–19:57 local time (17:55–17:57 UTC), summary prepared at 20:00 local time. Median: 1.8 µg/m³; range across sensors: 0.7–3.9 µg/m³.

In Lyon the air is good right now (approximate, US EPA scale). From 07:00 to 20:00 local time the city mean PM2.5 fell from 3.5 to 2.0 µg/m³.

The weather data do not point to a clear reason for this level.

Weather now: cloudy, 15°C, wind 2 m/s, humidity 55%. By 05:00 the wind is expected to pick up to 4 m/s, which may clear the air. Precipitation is expected around 07:00; it may wash particles out.

Written automatically at 20:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

7 km/h

Wind, S

0 mm

Precipitation today

Lyon: air quality for the completed day

Metric: PM2.5, µg/m³ · Color scale: EPA AQI · October 21, 2026 · 00:00–24:00 UTC

3 µg/m³ Low

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 3 of 16 cities in France and No. 262 of 297 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

Lyon: PM2.5 by month

Metric: PM2.5, µg/m³ · Color scale: EPA AQI

Mean
Oct
Nov
Dec
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
This month
2
-
-
-
-
-
-
-
2
2
3
3
1
4

Monthly means of quality-checked sensors, as in the Data Hub trend; the current month is still incomplete, “-” means no data.

Pollution accumulation index now

17%An estimate of weather conditions · not a PM2.5 forecast

Now1716
20.0004.0011.0019.00

Pollution accumulation forecast

Today — October 22

16°/6°

Index by time of day

56/100Moderate

  1. 56/100Night
  2. 46/100Morning
  3. 10/100Day
  4. 18/100Evening

Friday — October 23

18°/10°

Index by time of day

43/100Moderate

  1. 43/100Night
  2. 26/100Morning
  3. 7/100Day
  4. 26/100Evening

Saturday — October 24

12°/8°

Index by time of day

53/100Moderate

  1. 53/100Night
  2. 40/100Morning
  3. 8/100Day
  4. 19/100Evening

Sunday — October 25

16°/10°

Index by time of day

39/100Moderate

  1. 39/100Night
  2. 25/100Morning
  3. 8/100Day
  4. 27/100Evening

Monday — October 26

14°/6°

Index by time of day

57/100Moderate

  1. 57/100Night
  2. 44/100Morning
  3. 8/100Day
  4. 24/100Evening

Tuesday — October 27

20°/6°

Index by time of day

60/100Moderate

  1. 60/100Night
  2. 43/100Morning
  3. 5/100Day
  4. 19/100Evening

Forecast of conditions that trap pollution near the surface

Weather

15°

Cloudy. Feels like 13°C

  1. MorningFog6°C97%
  2. DayPartly cloudy15°C55%
  3. EveningCloudy13°C71%

Wind

7km/hWind from the S

18km/hWind gusts

Wind force: 2

Gusts up to 18 km/h are expected.

10-day weather forecast for Lyon

France

  1. TodayOct 22Cloudy16°C6°C
  2. FriOct 23Rain18°C10°C
  3. SatOct 24Rain12°C8°C
  4. SunOct 25Rain16°C10°C
  5. MonOct 26Cloudy14°C6°C
  6. TueOct 27Rain20°C6°C
  7. WedOct 28Rain16°C10°C
  8. ThuOct 29Cloudy15°C7°C
  9. FriOct 30Fog18°C7°C
  10. SatOct 31Partly cloudy17°C8°C

Where in Lyon is the air worse?

See all sensors

Highest current reading: 3.9 µg/m³ (SC #99344). Lowest: 0.7 µg/m³ (SC #44020). The list shows every sensor, highest first.

  1. SC #99344 →4 µg/m³
  2. SC #99369 →3 µg/m³
  3. SC #40122 →1 µg/m³
  4. SC #44020 →1 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Sensor.Community — 4 sensors.

Atmy shows the networks’ readings after the Data Hub’s quality check: test devices and sensors that fail it are left out.

France: sensors in total

203

  1. RennesFrance

    24

  2. StrasbourgFrance

    20

  3. VilleurbanneFrance

    14

Cities 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.

Air quality calendar: Lyon

Daily mean PM2.5 of the city sensors, µg/m³

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

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A card with the current PM2.5 in Lyon: it is refreshed every 15 minutes and links to this page. Paste the code into your site.

Air quality in Lyon now — Atmy

France · City ranking · All pilot cities

Questions

What was the air quality in Lyon over the last completed day?

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 3 µg/m³ from 4 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 3 of 16 cities in France and No. 262 of 297 worldwide, from the most polluted.

What is the air quality in Lyon right now?

Right now in Lyon, PM2.5 averages 2.0 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 4 sensors on the Atmy network, readings from 19:55–19:57 local time (17:55–17:57 UTC), summary prepared at 20:00 local time. Median: 1.8 µg/m³; range across sensors: 0.7–3.9 µg/m³.

Is it safe to be outdoors in Lyon now?

The current level is “good” (US EPA scale, approximate). Air quality is satisfactory; no restrictions are recommended. This is the standard guidance of the scale, not medical advice.

Where in Lyon is the air worse?

Highest current reading: 3.9 µg/m³ (SC #99344). Lowest: 0.7 µg/m³ (SC #44020). The list shows every sensor, highest first.

Where do these data come from?

From Atmy sensors and connected public networks (citizen, experimental and government monitors), aggregated by Atmy. Values are approximate; see the methodology.

How often is this page updated?

The summary is rebuilt every 15 minutes from the latest reading of each sensor, each no older than one hour.

Is the air in Lyon polluted?

Over the last 147 days with data, the mean daily PM2.5 in Lyon was 2.4 µg/m³ — within the WHO annual guideline (5 µg/m³). Over the last 30 days: 3.0 µg/m³. From Atmy's archive of daily city means.

When is the air in Lyon cleanest?

In Atmy's daily archive, the cleanest month of the last year was September 2026: 1.4 µg/m³ on average.

When is the air in Lyon most polluted?

The most polluted month of the last year was August 2026: 3.0 µg/m³ on average.

Data

Where do these data come from?

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