Worst air pollution Lewes, today and tomorrow
Today (16 July): Air quality in Lewes is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 29.1/100).
Tomorrow (17 July 2026): Air quality in Lewes is fair. NO2 increases to fair; all other pollutants stay as today. Pollution peaks around 8:00 PM (NO2: 38.4/100). 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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Being part of East Sussex, Lewes sees an air quality profile that's largely down to traffic and general town-centre activity. Thanks to northwesterly winds off the coast, pollution rarely lingers for long, which keeps average readings fairly unremarkable by UK standards. Emissions along the M74 represent the town's main traffic-related pollution source.
Today - 16 July | Pollution peaks at 17:00
AQI:
Fair
29.1/100
PM2.5 (fine particles):
Good
9.3/100
PM10 (coarse particles):
Good
3.3/100
NO2 (nitrogen dioxide):
Good
19.1/100
O3 (ozone):
Fair
29.1/100
SO2 (sulfur dioxide):
Good
1.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
7.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 20:00
AQI:
Fair
38.4/100
PM2.5 (fine particles):
Good
13.5/100
PM10 (coarse particles):
Good
4.6/100
NO2 (nitrogen dioxide):
Fair
38.4/100
O3 (ozone):
Fair
23.0/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
3.5/100
PM1 (ultrafine particles):
Good
13.1/100
Pollen forecast in Lewes
View pollen forecastFrequently Asked Questions
Is air quality bad in Lewes right now?
On 16 July 2026, overall air quality in Lewes is fair. AQI is the main air quality indicator at 29.1/100. Pollution peaks around 5:00 PM (O3: 29.1/100).
Will air quality be worse tomorrow in Lewes?
On 17 July 2026, air quality conditions in Lewes will be similar to today, with AQI forecast at fair at 38.4/100. Pollution peaks around 8:00 PM (NO2: 38.4/100).
When is air pollution at its worst in Lewes?
In Lewes, pollution levels don't stay flat — winter and summer look pretty different. By summer, ozone tends to rise on bright days, while better ventilation generally keeps particulate and NO₂ levels lower than winter. Come winter, NO₂ and PM2.5 usually creep up, as heating and calmer air let M74 traffic emissions linger rather than disperse. Most of spring and autumn stays fairly steady, right in the middle of those two extremes.
Are air quality levels in Lewes 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