AIR QUALITY • SMOG • AIR POLLUTION
Check air pollution levels in your city. Compare PM2.5 and PM10 concentrations, explore ozone and nitrogen dioxide data, and follow changes over recent days.
United Kingdom
PM2.5 · FairData time: September 7, 2026, 02:00
local time · CAMS model • Open-Meteo
Freshness by the local date recorded in the data: 2026-09-07 - 2026-09-08. Where does the data come from? →
CAMS model • Open-Meteo
µg/m³
PM2.5 · Fairµg/m³
PM2.5 · Fairµg/m³
PM2.5 · Goodµg/m³
PM2.5 · Goodµg/m³
PM2.5 · Fairµg/m³
PM2.5 · Fairµg/m³
PM2.5 · Goodµg/m³
PM2.5 · FairConcentration in µg/m³ · local time
RECENT DAYS · London
Daily mean PM2.5 for completed days. The current card represents a single hour and can differ from the daily mean.
| Date | PM2.5 µg/m³ |
|---|---|
| August 31, 2026 | 3.4 |
| September 1, 2026 | 5 |
| September 2, 2026 | 5.4 |
| September 3, 2026 | 4 |
| September 4, 2026 | 3.8 |
| September 5, 2026 | 4.9 |
| September 6, 2026 | 7.6 |
PM2.5 · September 7, 2026
Which cities have the most polluted air, and which have the cleanest? Compare cities by PM2.5 concentration. These rankings cover 1,193 cities with data from the date shown.
Worldwide city rankings
Highest PM2.5 concentrations
Concentration in µg/m³ · local time
Worldwide city rankings
Lowest PM2.5 concentrations
Concentration in µg/m³ · local time
We compare the latest available hourly PM2.5 values from the same day using CAMS model data. Times beside cities are local. The order applies to this comparison, not annual averages or AQI scores. How is the ranking made? →
AIR AND SEA TEMPERATURE
Compare forecasts for country reference points and selected coastal locations. These values are not averages for an entire country or sea.
Daytime temperature · September 8, 2026
Compared: 226 points on the same date.
Full ranking →Daytime temperature · September 8, 2026
Compared: 226 points on the same date.
Full ranking →Sea surface temperature · September 8, 2026
Compared: 78 points on the same date.
Sea surface temperature · September 8, 2026
Compared: 78 points on the same date.
WEATHER THROUGH THE YEAR
Choose a month to compare daytime and nighttime temperatures and the frequency of rain using historical weather data.
Mean daily maximum temperatures by month · Bar scale starts at -15°C
NASA POWER: grid data covering the city. Weather history describes the climate; it is not a forecast or an air quality measurement.
| Month | Mean daily maximum °C | Mean daily minimum °C | Days with rainfall ≥1 mm |
|---|---|---|---|
| January | 7 | 1.3 | 42.6% |
| February | 8.9 | 2.3 | 41.7% |
| March | 11.1 | 3.2 | 41.9% |
| April | 13.9 | 4.1 | 31% |
| May | 17.7 | 7.5 | 34.2% |
| June | 21.2 | 10.9 | 32.7% |
| July | 23.4 | 13 | 33.2% |
| August | 23.3 | 12.9 | 31.6% |
| September | 20.6 | 10.8 | 37.7% |
| October | 15.9 | 8.1 | 42.3% |
| November | 10.6 | 4.5 | 43.7% |
| December | 8.3 | 3.6 | 44.5% |
POLLUTION ALERT
Choose a country to compare air pollution in its cities and explore the available historical data.
PM2.5 · PM10 · NO₂ · O₃
PM2.5 and PM10 are fractions of airborne particulate matter. PM2.5 covers fine particles up to 2.5 micrometres in diameter, while PM10 covers particles up to 10 micrometres. Concentrations in µg/m³ tell you how many micrograms of particles are present in a cubic metre of air. Compare values over the same time period.
The latest concentrations come from the CAMS atmospheric model via Open-Meteo for each city’s coordinates. Values describe a model area, so conditions on individual streets may differ. Historical monitoring station data is shown separately where available.
PM2.5 is the concentration of one particle fraction, expressed in µg/m³. AQI is an index calculated using a particular scale and thresholds. The pollutant cards show concentrations. Our city ranking compares PM2.5; PM10, ozone, nitrogen dioxide and other available gases add to the picture of air quality.
Each current value has a data date and time. Current concentration cards show the latest available hour, daily charts summarise individual days, and monthly records let you compare longer periods. These values represent different time intervals.
Search for your city and open its air quality page. Start with PM2.5 and PM10, then check the other available pollutants and the data timestamp. Charts and tables help you compare concentrations over time. Weather and historical climate information complement the pollution data.