Southampton Air Quality
Data from Open-Meteo Air Quality API • Last checked: 23:46 on Wednesday 28 October 2026
Current Pollutant Readings
| Pollutant | Reading | Units | DAQI | Band |
|---|---|---|---|---|
| PM10 Particles | 15.1 | ยตg/mยณ | 1 | Low |
| PM2.5 Particles | 8.3 | ยตg/mยณ | — | — |
| Nitrogen Dioxide | 14.1 | ยตg/mยณ | 1 | Low |
| Ozone | 42.0 | ยตg/mยณ | 2 | Low |
| Sulphur Dioxide | 1.0 | ยตg/mยณ | 1 | Low |
| Carbon Monoxide | 0.172 | mg/mยณ | 1 | Low |
PM2.5 is shown for reference; it is not part of the UK DAQI calculation. Readings are hourly spot values from the Open-Meteo forecast model.
5-Day Air Quality Outlook
| Wed 28 Oct | Thu 29 Oct | Fri 30 Oct | Sat 31 Oct | Sun 1 Nov |
|---|---|---|---|---|
|
3
Low
avg 2.3
|
3
Low
avg 1.8
|
2
Low
avg 2
|
2
Low
avg 2
|
2
Low
avg 1.8
|
Southampton City Centre — DEFRA Roadside Monitor
|
This air monitoring station is within a self-contained, air-conditioned housing located at the junction of a residential road and a six-lane dual carriageway between Northam and the city centre. Traffic flow is approximately 25,000 vehicles per day, subject to periodic congestion during peak periods. The manifold inlet is approximately 10 metres from the residential road kerbside at a height of approximately 3 metres. The surrounding area is predominantly urban residential.
Site address: Brintons Road / Northam Road, Southampton, Hampshire |
 Brintons Road / Northam Road monitoring station |
Realtime Air Quality Graphs — Past 7 Days (Station SA33)
About the UK Daily Air Quality Index
In the UK, most air pollution information services use the index and banding system approved by the Committee on Medical Effects of Air Pollution Episodes. The system uses a 1–10 index divided into four bands, similar to the UV or pollen index.
| Band | Index | Health advice for sensitive individuals |
|---|---|---|
| Low | 1, 2 or 3 | Effects are unlikely to be noticed even by individuals who know they are sensitive to air pollutants. |
| Moderate | 4, 5 or 6 | Mild effects, unlikely to require action, may be noticed amongst sensitive individuals. |
| High | 7, 8 or 9 | Significant effects may be noticed by sensitive individuals and action may be needed (e.g. reducing time in polluted areas outdoors). Asthmatics will find their ‘reliever’ inhaler is likely to reverse effects on the lung. |
| Very High | 10 | The effects on sensitive individuals described for High levels of pollution may worsen. |
Air pollution can cause short-term health effects to sensitive individuals (people with heart disease or lung conditions, including asthma). Effects can be reduced by spending less time outdoors in polluted areas. ‘Reliever’ inhalers should lessen effects on asthma sufferers.
A Guide to UK Air Pollution Information Resources (DEFRA PDF)
Index Boundaries for Each Pollutant
| Band | Index | Ozone (ยตg/mยณ) 8h or 1h mean |
NO2 (ยตg/mยณ) 1h mean |
SO2 (ยตg/mยณ) 15min mean |
CO 8h mean |
PM10 (ยตg/mยณ) 24h mean |
|||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| ยตg/mยณ | ppb | ยตg/mยณ | ppb | ยตg/mยณ | ppb | mg/mยณ | ppm | Grav. | Ref. | ||
| Low | 1 | 0โ33 | 0โ16 | 0โ95 | 0โ49 | 0โ88 | 0โ32 | 0โ3.8 | 0.0โ3.2 | 0โ21 | 0โ19 |
| 2 | 34โ65 | 17โ32 | 96โ190 | 50โ99 | 89โ176 | 33โ66 | 3.9โ7.6 | 3.3โ6.6 | 22โ42 | 20โ40 | |
| 3 | 66โ99 | 33โ49 | 191โ286 | 100โ149 | 177โ265 | 67โ99 | 7.7โ11.5 | 6.7โ9.9 | 43โ64 | 41โ62 | |
| Moderate | 4 | 100โ125 | 50โ62 | 287โ381 | 150โ199 | 266โ354 | 100โ132 | 11.6โ13.4 | 10.0โ11.5 | 65โ74 | 63โ72 |
| 5 | 126โ153 | 63โ76 | 382โ477 | 200โ249 | 355โ442 | 133โ166 | 13.5โ15.4 | 11.6โ13.2 | 75โ86 | 73โ84 | |
| 6 | 154โ179 | 77โ89 | 478โ572 | 250โ299 | 443โ531 | 167โ199 | 15.5โ17.3 | 13.3โ14.9 | 87โ96 | 85โ94 | |
| High | 7 | 180โ239 | 90โ119 | 573โ635 | 300โ332 | 532โ708 | 200โ266 | 17.4โ19.2 | 15.0โ16.5 | 97โ107 | 95โ105 |
| 8 | 240โ299 | 120โ149 | 636โ700 | 333โ366 | 709โ886 | 267โ332 | 19.3โ21.2 | 16.6โ18.2 | 108โ118 | 106โ116 | |
| 9 | 300โ359 | 150โ179 | 701โ763 | 367โ399 | 887โ1063 | 333โ399 | 21.3โ23.1 | 18.3โ19.9 | 119โ129 | 117โ127 | |
| Very High | 10 | ≥360 | ≥180 | ≥764 | ≥400 | ≥1064 | ≥400 | ≥23.2 | ≥20 | ≥130 | ≥128 |
* For ozone, the maximum of the 8-hourly and hourly mean is used to calculate the index value.
Banding system © 2012 The UK Department for Environment, Food & Rural Affairs.
Forecast data: Open-Meteo (CC BY 4.0) • Realtime monitoring: DEFRA UK-Air station SA33