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Overview

South East · Unitary authority

Southampton

2026/27 view

Southampton · ONS E06000045

Financial position as at 2026/27 Q1 quarter end

View sources
PEOPLE AND PLACE

Population and community profile

Latest official statistics
Population 259,424 2024
South East region 9,642,942
Southampton represents 2.69% of the region's population
Five-year population change
+9,996 residents ↑ 4.0%
2019: 249,428 residents2020: 248,679 residents2021: 247,672 residents2022: 252,178 residents2023: 257,387 residents2024: 259,424 residents
Southampton +4.0%
South East +4.9%
England +4.3%
Growth context

Southampton's population grew over five years. Its change was 0.9 percentage points below the South East and broadly in line with England.

2019–2024 ONS mid-year estimates
Population estimates and labour-market measures from ONS/Nomis.Official profile
AIR QUALITY

How clean is the air?

Long-term particulate pollution across the council area, alongside measurements from local UK-AIR monitoring stations.

Defra 2,024
POPULATION-WEIGHTED ANNUAL MEAN

Fine particulate matter

6.5 µg/m³

PM2.5 · 2,024

Human-related sources 6.0 µg/m³
Other sources 0.5 µg/m³
Modelled population-weighted annual concentration across the local authority area. This is not a live sensor reading.
LONG-TERM TREND

PM2.5 over time

53.2%
13.9 6.5
2011: 13.87 µg/m³ 2012: 12.23 µg/m³ 2013: 12.10 µg/m³ 2014: 11.60 µg/m³ 2015: 10.49 µg/m³ 2016: 12.05 µg/m³ 2017: 10.75 µg/m³ 2018: 11.22 µg/m³ 2019: 9.32 µg/m³ 2020: 8.49 µg/m³ 2021: 7.84 µg/m³ 2022: 8.16 µg/m³ 2023: 6.71 µg/m³ 2024: 6.50 µg/m³
2011 2024
Since 2011 ↓ 53.2%
5 years ↓ 30.3%
10 years ↓ 44.0%
CURRENT MONITORING

Latest station measurement

UK-AIR
PM2.5 8.4 µg/m³
Provisional
Last 24 hours 4.2 – 10.4 µg/m³
2026-09-22 02:00:00+01: 4.9 µg/m³ 2026-09-22 03:00:00+01: 4.6 µg/m³ 2026-09-22 04:00:00+01: 4.4 µg/m³ 2026-09-22 05:00:00+01: 4.2 µg/m³ 2026-09-22 06:00:00+01: 4.2 µg/m³ 2026-09-22 07:00:00+01: 4.8 µg/m³ 2026-09-22 08:00:00+01: 5.4 µg/m³ 2026-09-22 09:00:00+01: 5.7 µg/m³ 2026-09-22 10:00:00+01: 5.3 µg/m³ 2026-09-22 11:00:00+01: 7.1 µg/m³ 2026-09-22 12:00:00+01: 7.5 µg/m³ 2026-09-22 13:00:00+01: 6.7 µg/m³ 2026-09-22 14:00:00+01: 5.9 µg/m³ 2026-09-22 15:00:00+01: 6.3 µg/m³ 2026-09-22 16:00:00+01: 6.1 µg/m³ 2026-09-22 17:00:00+01: 6.6 µg/m³ 2026-09-22 18:00:00+01: 6.2 µg/m³ 2026-09-22 19:00:00+01: 5.9 µg/m³ 2026-09-22 20:00:00+01: 6.2 µg/m³ 2026-09-22 21:00:00+01: 7.8 µg/m³ 2026-09-22 22:00:00+01: 8.5 µg/m³ 2026-09-22 23:00:00+01: 10.4 µg/m³ 2026-09-23 00:00:00+01: 6.8 µg/m³ 2026-09-23 01:00:00+01: 8.4 µg/m³
Southampton A33 Automatic Urban and Rural Monitoring Network (AURN); UK Urban NO2 Network · Urban Traffic Latest measurement: 2026-09-23 01:00:00+01

This is a measurement from an individual monitoring station and should not be interpreted as the current concentration across the whole council area.

HEALTH IMPACT

Particulate air pollution

4.9% of mortality attributable to particulate air pollution
2024 Not compared

This OHID measure estimates the mortality burden associated with particulate air pollution. It is a health-impact measure, not a pollution concentration.

Annual PM2.5 is Defra Pollution Climate Mapping data. Monitoring readings are station-specific UK-AIR measurements and may be provisional. Defra source