London Air Pollution: Real-time Air Quality Index (AQI)

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London AQI: London Real-time Air Quality Index (AQI).
45
Good
Updated on Thursday 12:00
temperature: 13°C
currentpast 2 daysminmax
PM2.5 AQI
45London PM25 (fine particulate matter) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.595
PM10 AQI
22London PM10 (respirable particulate matter) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.657
O3 AQI
24London O3 (ozone) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.1030
NO2 AQI
9London NO2 (nitrogen dioxide) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.644
SO2 AQI
1London SO2 (sulfur dioxide) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.12
CO AQI
6London CO (carbon monoxide) measured by : • UK-AIR, air quality information resource - Defra, UK • London Air Quality Network - Environmental Research Group, King s College London. Values are converted to the US EPA AQI standard.27
Temp.
13London t (temp.) measured by Citizen Weather Observer Program (CWOP/APRS).716
Pressure
1022London p (pressure:) measured by Citizen Weather Observer Program (CWOP/APRS).10221028
Humidity
72London h (humidity) measured by Citizen Weather Observer Program (CWOP/APRS).5393
Wind
7London w (wind) measured by Citizen Weather Observer Program (CWOP/APRS).17
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Air Quality Forecast
THU 27
17°C
7°C
FRI 28
13°C
6°C
SAT 29
13°C
4°C
SUN 30
17°C
8°C
MON 31
15°C
8°C
PM2.5
O3
Thursday 27Friday 28Saturday 29Sunday 30Monday 31
hour
03691215182103691215182103691215182104710131619221471013161922
Wind Speed (m/s)
3334455456667765544345667657654332344554








































Temp.
9°8°8°13°17°17°13°10°9°9°9°10°13°11°9°7°5°4°5°9°12°12°10°8°8°9°11°15°17°15°12°10°9°8°10°14°15°13°9°8°
relative humidity
93978867505173868486878247405567727674513839597283918343424966757980614442506777
barometric pressure
1024102310231022101910171017101710141013101210121012101310151017101810191021102310221022102310221019101910191020102110221024102510261026102710271026102610271026
total precipitation
0.5
UVI:
4


5:50 ~ 18:24
UVI:
3


5:48 ~ 18:25
UVI:
4


5:46 ~ 18:27
UVI:
4


5:43 ~ 18:29
UVI:
4


5:39 ~ 18:32
Forecast plotted using timezone +00:00
Latest forecast updates:
Wind: 2 hours ago [Mar 27, 2025 11:24 AM]
fine particulate matter: 10 hours ago [Mar 27, 2025 3:01 AM]
ozone: 10 hours ago [Mar 27, 2025 3:02 AM]
click to view the detailed forecast

Air Quality Data provided by: UK-AIR, air quality information resource - Defra, UK (uk-air.defra.gov.uk) and London Air Quality Network - Environmental Research Group, King's College London (londonair.org.uk)

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About the Air Quality and Pollution Measurement:

About the Air Quality Levels

AQIAir Pollution LevelHealth ImplicationsCautionary Statement (for PM2.5)
0 - 50GoodAir quality is considered satisfactory, and air pollution poses little or no riskNone
51 -100ModerateAir quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
101-150Unhealthy for Sensitive GroupsMembers of sensitive groups may experience health effects. The general public is not likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should limit prolonged outdoor exertion.
151-200UnhealthyEveryone may begin to experience health effects; members of sensitive groups may experience more serious health effectsActive children and adults, and people with respiratory disease, such as asthma, should avoid prolonged outdoor exertion; everyone else, especially children, should limit prolonged outdoor exertion
201-300Very UnhealthyHealth warnings of emergency conditions. The entire population is more likely to be affected.Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else, especially children, should limit outdoor exertion.
300+HazardousHealth alert: everyone may experience more serious health effectsEveryone should avoid all outdoor exertion

To know more about Air Quality and Pollution, check the wikipedia Air Quality topic or the airnow guide to Air Quality and Your Health.

For very useful health advices of Beijing Doctor Richard Saint Cyr MD, check www.myhealthbeijing.com blog.


Usage Notice: All the Air Quality data are unvalidated at the time of publication, and due to quality assurance these data may be amended, without notice, at any time. The World Air Quality Index project has exercised all reasonable skill and care in compiling the contents of this information and under no circumstances will the World Air Quality Index project team or its agents be liable in contract, tort or otherwise for any loss, injury or damage arising directly or indirectly from the supply of this data.



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