Forecast

Today

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Issued By:
Environmental Research Group
Imperial College London

Issued On: 08/07/2025 11:46:21

Pollution Band: Low

Details

A hot sunny day on Wednesday with a high pressure system centered just to the south west of the UK.

A relatively 'clean' air feed from the Atlantic is not expected to contain any significant pollution and a light breeze should also prevent build-up of local emissions.

Increased ground level ozone formation is expected, mostly as locally emitted pollutants react photochemically in strong sunshine and warm temperatures. However, some forecasted cloud cover later in the day and a relatively 'clean' airfeed, should ensure that overall ozone levels remain 'Low'. The national Daily Air Quality Index for ozone is measured on a running 8 hour mean.

Air pollution is expected to remain 'Low' for the following pollutants:

PM10 Particulates
PM2.5 Particulates
Nitrogen Dioxide
Ozone
Sulphur Dioxide


This forecast is intended to provide information on expected pollution levels in areas of significant public exposure. It may not apply in very specific locations close to unusually strong or short-lived local sources of pollution.

Outlook

Forecast icon

Issued By:
Environmental Research Group
Imperial College London

Issued On: 09/07/2025 11:27:33

Pollution Band: Moderate

Details

A hot sunny day with temperatures forecast to reach over thirty degrees.

A relatively 'clean' air feed from the Atlantic early on, slower moving in the afternoon having travelled at low altitude over the UK and Ireland. There is likely to be some pollution associated with this latter route. Good dispersion especially later as a breeze picks up locally.

Increased ground level ozone formation is expected as any pollution present reacts photochemically in strong sunshine and very warm temperatures. As a result 'Moderate' ozone levels are forecast.

Air pollution is expected to remain 'Low' for the following pollutants:

PM10 Particulates
PM2.5 Particulates
Nitrogen Dioxide
Sulphur Dioxide


This forecast is intended to provide information on expected pollution levels in areas of significant public exposure. It may not apply in very specific locations close to unusually strong or short-lived local sources of pollution.

How to use the Daily Air Quality Index *

  • Step 1: Determine whether you (or your children) are likely to be at-risk from air pollution. Your doctor may also be able to give you advice.
  • Step 2: If you may be at-risk, and are planning strenuous activity outdoors, check the air pollution forecast.
  • Step 3: Use the health messages corresponding to the highest forecast level of pollution as a guide.
Air Pollution Banding Value Accompanying health messages for at-risk groups and
the general population
At-risk individuals ** General population
Low 1-3 Enjoy your usual outdoor activities.

Enjoy your usual outdoor activities.

Moderate 4-6 Adults and children with lung problems, and adults with heart problems, who experience symptoms, should consider reducing strenuous physical activity, particularly outdoors. Enjoy your usual outdoor activities.
High 7-9 Adults and children with lung problems, and adults with heart problems, should reduce strenuous physical exertion, particularly outdoors, and particularly if they experience symptoms. People with asthma may find they need to use their reliever inhaler more often. Older people should also reduce physical exertion. Anyone experiencing discomfort such as sore eyes, cough or sore throat should consider reducing activity, particularly outdoors.
Very High 10 Adults and children with lung problems, adults with heart problems, and older people, should avoid strenuous physical activity. People with asthma may find they need to use their reliever inhaler more often. Reduce physical exertion, particularly outdoors, especially if you experience symptoms such as cough or sore throat.

* Daily Air Quality Index information sourced from UK-AIR (Air Information Resource) website.

* Adults and children with heart or lung problems are at greater risk of symptoms. Follow your doctor's usual advice about exercising and managing your condition. It is possible that very sensitive individuals may experience health effects even on Low air pollution days.

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