Air quality and transport
The council reports reduced nitrogen dioxide across its monitoring network. Annual averages are not a live air-quality reading. Transport projects, vehicle standards and other factors can all affect air quality.
What the evidence says
City council · transport operators
−30%
Change in monitored nitrogen dioxide
Council-reported reduction across its monitoring network. Does not describe all pollutants or every location.
Southampton City Council · 2019–2024
Checked 3 October 202640µg/m³
Annual nitrogen dioxide legal limit
Annual concentration objective, not a city measurement.
Southampton City Council · As cited March 2026
Checked 3 October 202622.2m
Local bus passenger journeys
Journeys on services in the city; includes repeat trips and visitors, not unique residents.
Southampton City Council / DfT · 2024/25
Checked 3 October 202621.7m
Local bus passenger journeys, previous year
Same council/DfT release.
Southampton City Council / DfT · 2023/24
Checked 3 October 2026Who can help?
Southampton City Council
Potholes, local roads and parking
Use the city council for local road defects, street lighting and parking. National Highways deals with the strategic road network.
Open official service → More helpCheck the detail
| Measure | Southampton / area | Period | Source |
|---|---|---|---|
| Change in monitored nitrogen dioxide | −30% change · Southampton | 2019–2024 | Southampton City Council |
| Annual nitrogen dioxide legal limit | 40 µg/m³ · England | As cited March 2026 | Southampton City Council |
| Local bus passenger journeys | 22.2m journeys · Southampton | 2024/25 | Southampton City Council / DfT |
| Local bus passenger journeys, previous year | 21.7m journeys · Southampton | 2023/24 | Southampton City Council / DfT |