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Air quality · England, United Kingdom

London Air Quality Index (AQI) today

Modelled estimate for 11:00 local time (UTC+0), refreshed 3 Nov, 07:52 UTC+0.

27 Good

Live estimate · modelled

US EPA AQI11:00 UTC+0, 3 Nov Main pollutant: O₃

Air quality is satisfactory, and air pollution poses little or no risk.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 23.

Over the next 24 hours the model expects the AQI to range from 25 around 19:00 to 50 around 08:00 (4 Nov).

798th most polluted of 849 cities worldwide right now, 2nd of 3 in United Kingdom.

What to do today

  • Long walk or run outside OK
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is satisfactory, and air pollution poses little or no risk.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

12:00 · 25 13:00 · 26 14:00 · 26 15:00 · 27 16:00 · 28 17:00 · 29 18:00 · 29 19:00 · 30 20:00 · 30 21:00 · 29 22:00 · 29 23:00 · 28 00:00 · 26 01:00 · 26 02:00 · 26 03:00 · 27 04:00 · 27 05:00 · 27 06:00 · 27 07:00 · 27 08:00 · 27 09:00 · 27 10:00 · 27 11:00 · 27 12:00 · 27 13:00 · 27 14:00 · 27 15:00 · 27 16:00 · 27 17:00 · 27 18:00 · 26 19:00 · 25 20:00 · 26 21:00 · 28 22:00 · 32 23:00 · 36 00:00 · 40 01:00 · 46 02:00 · 46 03:00 · 46 04:00 · 45 05:00 · 44 06:00 · 42 07:00 · 45 08:00 · 50 09:00 · 49 10:00 · 39 11:00 · 31 12:00 · 29 13:00 · 27 14:00 · 24 15:00 · 24 16:00 · 24 17:00 · 26 18:00 · 31 19:00 · 33 20:00 · 34 21:00 · 36 22:00 · 38 23:00 · 39 00:00 · 38 01:00 · 36 02:00 · 33 03:00 · 32 04:00 · 32 05:00 · 33 06:00 · 36 07:00 · 44 Now

US EPA AQI per hour, UTC+0. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 12:0025
Mon 13:0026
Mon 14:0026
Mon 15:0027
Mon 16:0028
Mon 17:0029
Mon 18:0029
Mon 19:0030
Mon 20:0030
Mon 21:0029
Mon 22:0029
Mon 23:0028
Tue 00:0026
Tue 01:0026
Tue 02:0026
Tue 03:0027
Tue 04:0027
Tue 05:0027
Tue 06:0027
Tue 07:0027
Tue 08:0027
Tue 09:0027
Tue 10:0027
Tue 11:00 · Now27
Tue 12:00 · Forecast27
Tue 13:00 · Forecast27
Tue 14:00 · Forecast27
Tue 15:00 · Forecast27
Tue 16:00 · Forecast27
Tue 17:00 · Forecast27
Tue 18:00 · Forecast26
Tue 19:00 · Forecast25
Tue 20:00 · Forecast26
Tue 21:00 · Forecast28
Tue 22:00 · Forecast32
Tue 23:00 · Forecast36
Wed 00:00 · Forecast40
Wed 01:00 · Forecast46
Wed 02:00 · Forecast46
Wed 03:00 · Forecast46
Wed 04:00 · Forecast45
Wed 05:00 · Forecast44
Wed 06:00 · Forecast42
Wed 07:00 · Forecast45
Wed 08:00 · Forecast50
Wed 09:00 · Forecast49
Wed 10:00 · Forecast39
Wed 11:00 · Forecast31
Wed 12:00 · Forecast29
Wed 13:00 · Forecast27
Wed 14:00 · Forecast24
Wed 15:00 · Forecast24
Wed 16:00 · Forecast24
Wed 17:00 · Forecast26
Wed 18:00 · Forecast31
Wed 19:00 · Forecast33
Wed 20:00 · Forecast34
Wed 21:00 · Forecast36
Wed 22:00 · Forecast38
Wed 23:00 · Forecast39
Thu 00:00 · Forecast38
Thu 01:00 · Forecast36
Thu 02:00 · Forecast33
Thu 03:00 · Forecast32
Thu 04:00 · Forecast32
Thu 05:00 · Forecast33
Thu 06:00 · Forecast36
Thu 07:00 · Forecast44

Pollutants this hour

  • PM2.5 3.4 µg/m³ 24-hour mean 4.2 µg/m³ · within WHO’s 24-hour guideline (15) 19
  • PM10 8 µg/m³ 7
  • O₃ 61 µg/m³ 27
  • NO₂ 12 µg/m³ 6
  • SO₂ 1 µg/m³ 0
  • CO 0.16 mg/m³ 1

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Birmingham England 25
Brussels Belgium 61
Rotterdam Netherlands 34
Paris France 56
Amsterdam Netherlands 31
Dublin Ireland 26
Düsseldorf Germany 56

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at London’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in London right now?
27 on the US EPA scale (Good) at 11:00 UTC+0, 3 Nov. O₃ is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in London today?
For most people, yes. The EPA’s statement for “Good”: Air quality is satisfactory, and air pollution poses little or no risk. General guidance, not medical advice.

Will the air in London get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 25 around 19:00 to 50 around 08:00 (4 Nov). Forecasts beyond a day are less certain.

How does London compare with other cities?
Right now it is the 798th most polluted of 849 cities we track worldwide, and 2nd of 3 in United Kingdom, all on the same US EPA scale.

Why does another app show a different AQI for London?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.