City of London air quality now

Great Britain · The summary is refreshed every 15 minutes.

October 22

The air is clean now

City of London

15°C

Partly cloudy

45AQI

1009hPa

Atmospheric
pressure

52%

Humidity

City of London, October 21, 2026: daily mean PM2.5 6 µg/m³ (19 sensors), level “Low” — as in the Atmy Data Hub. Now (19:00 local time): 8.1 µg/m³. Open methodology and data in JSON: Methodology and data sources · JSON

Right now in City of London, PM2.5 averages 8.1 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 19 sensors on the Atmy network, readings from 18:47–18:57 local time (17:47–17:57 UTC), summary prepared at 19:00 local time. Median: 2.0 µg/m³; range across sensors: 0.0–35.7 µg/m³.

In City of London the air is good right now (approximate, US EPA scale). From 06:00 to 19:00 local time the city mean PM2.5 rose from 4.9 to 8.1 µg/m³.

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

Weather now: partly cloudy, 15°C, wind 3 m/s, humidity 52%. By 01:00 the wind is expected to pick up to 5 m/s, which may clear the air. Precipitation is expected around 21:00; it may wash particles out. By 06:00 the temperature will be about 12°C.

Written automatically at 19:00 local time (18:00 UTC) from sensor measurements and the weather forecast. Values are approximate; hypotheses are marked.

11 km/h

Wind, SW

0 mm

Precipitation today

City of London: air quality for the completed day

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

6 µg/m³ Low

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 6 µg/m³ from 19 sensors that passed the quality check — the same value as in the Atmy Data Hub.

No. 3 of 4 cities in Great Britain and No. 197 of 297 worldwide, from the most polluted.

LowModerateElevatedHighVery highExtremely high

City of London: 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
8
4
4
6
7
5
10
5
6
5
11
19
11
10

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

13%An estimate of weather conditions · not a PM2.5 forecast

Now1314
19.0003.0010.0018.00

Pollution accumulation forecast

Today — October 22

15°/9°

Index by time of day

40/100Moderate

  1. 40/100Night
  2. 31/100Morning
  3. 6/100Day
  4. 16/100Evening

Friday — October 23

13°/9°

Index by time of day

22/100Low

  1. 19/100Night
  2. 22/100Morning
  3. 7/100Day
  4. 15/100Evening

Saturday — October 24

15°/8°

Index by time of day

36/100Moderate

  1. 36/100Night
  2. 33/100Morning
  3. 7/100Day
  4. 11/100Evening

Sunday — October 25

13°/10°

Index by time of day

31/100Low

  1. 31/100Night
  2. 20/100Morning
  3. 4/100Day
  4. 19/100Evening

Monday — October 26

17°/9°

Index by time of day

43/100Moderate

  1. 43/100Night
  2. 33/100Morning
  3. 7/100Day
  4. 9/100Evening

Tuesday — October 27

17°/11°

Index by time of day

24/100Low

  1. 19/100Night
  2. 24/100Morning
  3. 7/100Day
  4. 18/100Evening

Forecast of conditions that trap pollution near the surface

Weather

15°

Partly cloudy. Feels like 12°C

  1. MorningPartly cloudy11°C81%
  2. DayPartly cloudy14°C56%
  3. EveningRain12°C90%

Wind

11km/hWind from the SW

22km/hWind gusts

Wind force: 2

Gusts up to 42 km/h are expected.

10-day weather forecast for City of London

Great Britain

  1. TodayOct 22Rain15°C9°C
  2. FriOct 23Rain13°C9°C
  3. SatOct 24Rain15°C8°C
  4. SunOct 25Partly cloudy13°C10°C
  5. MonOct 26Rain17°C9°C
  6. TueOct 27Rain17°C11°C
  7. WedOct 28Cloudy13°C9°C
  8. ThuOct 29Cloudy14°C6°C
  9. FriOct 30Cloudy13°C8°C
  10. SatOct 31Cloudy15°C9°C

Where in City of London is the air worse?

See all sensors

Highest current reading: 35.7 µg/m³ (Stondon Walk). Lowest: 0.0 µg/m³ (London). The list shows every sensor, highest first.

  1. Stondon Walk →36 µg/m³
  2. SC #26253 →33 µg/m³
  3. SC #54412 →27 µg/m³
  4. SC #84223 →16 µg/m³
  5. SC #91293 →14 µg/m³
  6. SC #72257 →9 µg/m³
  7. UAL Creative Computing Institute, Peckham Road Building →4 µg/m³
  8. SC #25359 →3 µg/m³
  9. SC #64738 →2 µg/m³
  10. SC #63259 →2 µg/m³
+9 more sensors
  1. SC #49111 →2 µg/m³
  2. SC #78414 →2 µg/m³
  3. SC #60354 →2 µg/m³
  4. SC #77668 →2 µg/m³
  5. SC #29730 →1 µg/m³
  6. Islington →1 µg/m³
  7. SC #100241 →1 µg/m³
  8. SC #24901 →0 µg/m³
  9. London →0 µg/m³

Source: atmy.ai monitoring network

Who provides the data

Sensors in the summary by network: Sensor.Community — 15 sensors, AirGradient — 4 sensors.

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

Great Britain: sensors in total

51

  1. City of LondonGreat Britain

    19

  2. AberdeenGreat Britain

    8

  3. DundeeGreat Britain

    6

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: City of London

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

Click a day to see its date and value.

LowModerateElevatedHighVery highExtremely high

Widget for your site

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

Air quality in City of London now — Atmy

Great Britain · City ranking · All pilot cities

Questions

What was the air quality in City of London over the last completed day?

Daily mean PM2.5 on October 21, 2026 (00:00–24:00 UTC): 6 µg/m³ from 19 sensors that passed the quality check — the same value as in the Atmy Data Hub. No. 3 of 4 cities in Great Britain and No. 197 of 297 worldwide, from the most polluted.

What is the air quality in City of London right now?

Right now in City of London, PM2.5 averages 8.1 µg/m³ — “good” on the US EPA scale (approximate, from hourly readings). Mean of 19 sensors on the Atmy network, readings from 18:47–18:57 local time (17:47–17:57 UTC), summary prepared at 19:00 local time. Median: 2.0 µg/m³; range across sensors: 0.0–35.7 µg/m³.

Is it safe to be outdoors in City of London 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 City of London is the air worse?

Highest current reading: 35.7 µg/m³ (Stondon Walk). Lowest: 0.0 µg/m³ (London). 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 City of London polluted?

Over the last 365 days with data, the mean daily PM2.5 in City of London was 7.6 µg/m³ — 1.5 times the WHO annual guideline (5 µg/m³). Over the last 30 days: 9.9 µg/m³. From Atmy's archive of daily city means.

When is the air in City of London cleanest?

In Atmy's daily archive, the cleanest month of the last year was November 2025: 4.1 µg/m³ on average.

When is the air in City of London most polluted?

The most polluted month of the last year was August 2026: 17.5 µg/m³ on average.

Is the air in City of London worse in the heating season?

From November to March the mean daily PM2.5 was 6.4 µg/m³, from June to August 10.1 µg/m³ (last 365 days).

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