Highest air pollution Portsmouth, today and tomorrow
Today (1 July): Air quality in Portsmouth is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 PM (NO2: 26.8/100).
Tomorrow (2 July 2026): Air quality in Portsmouth is fair. All pollutants stay as today. Pollution peaks around 9:00 PM (NO2: 24.4/100). 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
Portsmouth's air quality reflects its position as a major Royal Navy port and ferry terminal, with shipping and ferry emissions from the Solent combining with vehicle traffic on the M275 motorway approach to elevate NOₓ along the harbour corridor. The Solent sea breezes generally provide good ventilation along the coastline, while the dense urban fabric of Portsea Island limits inland dispersal.
Today - 1 July | Pollution peaks at 21:00
AQI:
Fair
26.8/100
PM2.5 (fine particles):
Good
8.5/100
PM10 (coarse particles):
Good
3.0/100
NO2 (nitrogen dioxide):
Fair
26.8/100
O3 (ozone):
Fair
21.3/100
SO2 (sulfur dioxide):
Good
3.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
7.2/100
Levels show the poorest local air quality during the day
Tomorrow - 2 July | Pollution peaks at 21:00
AQI:
Fair
24.4/100
PM2.5 (fine particles):
Good
5.6/100
PM10 (coarse particles):
Good
2.1/100
NO2 (nitrogen dioxide):
Fair
24.4/100
O3 (ozone):
Fair
20.9/100
SO2 (sulfur dioxide):
Good
2.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
5.1/100
Pollen forecast in Portsmouth
View pollen forecastFrequently Asked Questions
Is air quality bad in Portsmouth right now?
On 1 July 2026, overall air quality in Portsmouth is fair. AQI is the main air quality indicator at 26.8/100. Pollution peaks around 9:00 PM (NO2: 26.8/100).
Will air quality be worse tomorrow in Portsmouth?
On 2 July 2026, air quality conditions in Portsmouth will be similar to today, with AQI forecast at fair at 24.4/100. Pollution peaks around 9:00 PM (NO2: 24.4/100).
Are air quality levels in Portsmouth 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.
Want to see air quality forecasts for other cities in United Kingdom?
Check air quality in other popular cities:
Data provided by Airmine — Last update: 1 July 2026 at 18:39 CET (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
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team