Worst air pollution Chesham, today and tomorrow
Today (16 July): Air quality in Chesham is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 34.0/100).
Tomorrow (17 July 2026): Air quality in Chesham is fair. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 43.6/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Rush-hour queues near the A46 are usually when readings climb the most. Air quality in Chesham is shaped by its location in Buckinghamshire, where vehicle traffic and everyday urban activity dominate local sources. Onshore breezes generally provide reasonable ventilation, keeping levels close to typical UK urban averages for a town this size.
Today - 16 July | Pollution peaks at 15:00
AQI:
Fair
34.0/100
PM2.5 (fine particles):
Good
10.9/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Fair
23.2/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.8/100
PM1 (ultrafine particles):
Good
10.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
43.6/100
PM2.5 (fine particles):
Good
15.0/100
PM10 (coarse particles):
Good
5.0/100
NO2 (nitrogen dioxide):
Fair
30.6/100
O3 (ozone):
Medium
43.6/100
SO2 (sulfur dioxide):
Good
4.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.2/100
PM1 (ultrafine particles):
Good
14.0/100
Pollen forecast in Chesham
View pollen forecastFrequently Asked Questions
Is air quality bad in Chesham right now?
On 16 July 2026, overall air quality in Chesham is fair. AQI is the main air quality indicator at 34.0/100. Pollution peaks around 3:00 PM (O3: 34.0/100).
Will air quality be worse tomorrow in Chesham?
On 17 July 2026, air quality conditions in Chesham will be similar to today, with NO2 forecast at fair at 30.6/100. Pollution peaks around 4:00 PM (O3: 43.6/100).
When is air pollution at its worst in Chesham?
Ask a local in Chesham and they'll tell you air quality changes noticeably from season to season. Summer brings a different issue — stronger sunlight can push up ozone levels on hot, sunny days, even though traffic pollution itself often disperses more easily. The coldest months usually bring the worst readings, as heating and temperature inversions keep A46 emissions from dispersing normally. For much of spring and autumn, things settle into a fairly unremarkable middle ground.
Are air quality levels in Chesham 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