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Real-time Air Quality Index

London AQI Today

25US AQI
Good

The current Air Quality Index in London, United Kingdom is 25, which is considered good. The fine particulate (PM2.5) concentration is 4.9 µg/m³.

Last updated · Source: CAMS forecast model

Pollutant levels in London

PM2.54.9 µg/m³Fine particulate matter
PM109.6 µg/m³Coarse particulate matter
O₃67 µg/m³Ozone
NO₂4.7 µg/m³Nitrogen dioxide
SO₂0.5 µg/m³Sulphur dioxide
CO172 µg/m³Carbon monoxide

Health advice

Air quality is good and poses little or no health risk. It is a great time for outdoor activities for everyone.

7-day AQI trend

DayAQICategory
Aug 1630Good
Aug 1741Good
Aug 1839Good
Aug 1929Good
Aug 2027Good
Aug 2125Good
Aug 2228Good

About the Air Quality Index

The Air Quality Index (AQI) converts measured pollutant concentrations — including PM2.5, PM10, ozone (O₃), nitrogen dioxide (NO₂), sulphur dioxide (SO₂), and carbon monoxide (CO) — into a single 0–500 scale. Higher values mean greater health risk. The reading for London reflects a CAMS forecast model and updates throughout the day. Learn what the AQI number means for your body, read the AQI scale reference, or compare PM2.5 and PM10.

Frequently asked questions about London air quality

What is the AQI in London today?

The current Air Quality Index in London, United Kingdom is 25 on the 0–500 US AQI scale, which is categorised as good. The reading comes from a CAMS forecast model and refreshes throughout the day.

What is the PM2.5 level in London right now?

Fine particulate matter (PM2.5) in London, United Kingdom is currently 4.9 µg/m³. The World Health Organization recommends keeping the 24-hour average below 15 µg/m³, so London is currently within the WHO guideline.

Is it safe to go outside in London today?

Air quality is good and poses little or no health risk. It is a great time for outdoor activities for everyone.

What is considered a good AQI level?

An AQI of 0–50 is good, 51–100 is moderate, 101–150 is unhealthy for sensitive groups, 151–200 is unhealthy, 201–300 is very unhealthy, and anything above 300 is hazardous. The scale is the same everywhere, so readings are directly comparable between cities.

How often is the London air quality data updated?

Air quality readings for London, United Kingdom refresh throughout the day, and this page is rendered fresh on every visit, so the AQI, pollutant breakdown and 7-day trend always reflect the latest available model output.

Air quality near London

Compare London with the closest monitored cities — pollution is regional, so neighbouring readings often move together.

Open the live AQI dashboard Compare cities← All cities