Worst air pollution Guildford, today and tomorrow
Today (16 July): Air quality in Guildford is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 35.5/100).
Tomorrow (17 July 2026): Air quality in Guildford is medium. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 48.7/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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The air quality picture in Guildford reflects a typical Surrey town, with traffic emissions and local commercial activity as key contributors. Onshore breezes tend to disperse pollutants reasonably well, keeping readings close to typical UK small-town levels. Emissions along the A303 represent the town's main traffic-related pollution source.
Today - 16 July | Pollution peaks at 14:00
AQI:
Fair
35.5/100
PM2.5 (fine particles):
Good
8.5/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Good
8.7/100
O3 (ozone):
Fair
35.5/100
SO2 (sulfur dioxide):
Good
1.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.3/100
PM1 (ultrafine particles):
Good
7.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
48.7/100
PM2.5 (fine particles):
Good
13.5/100
PM10 (coarse particles):
Good
4.4/100
NO2 (nitrogen dioxide):
Good
12.4/100
O3 (ozone):
Medium
48.7/100
SO2 (sulfur dioxide):
Good
2.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.7/100
PM1 (ultrafine particles):
Good
13.7/100
Pollen forecast in Guildford
View pollen forecastFrequently Asked Questions
Is air quality bad in Guildford right now?
On 16 July 2026, overall air quality in Guildford is fair. AQI is the main air quality indicator at 35.5/100. Pollution peaks around 2:00 PM (O3: 35.5/100).
Will air quality be worse tomorrow in Guildford?
On 17 July 2026, air quality conditions in Guildford will be better than today, with AQI forecast at medium at 48.7/100. Pollution peaks around 4:00 PM (O3: 48.7/100).
When is air pollution at its worst in Guildford?
Most of spring and autumn stays fairly steady, right in the middle of those two extremes. Here's the thing about Guildford: air quality has a clear seasonal rhythm. Come winter, NO₂ and PM2.5 usually creep up, as heating and calmer air let A303 traffic emissions linger rather than disperse. Come summer, it's ozone rather than particulates that's the bigger concern, especially on still, sunny days.
Are air quality levels in Guildford based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app