Forecast

Today

Forecast icon

Issued By:
Environmental Research Group
Imperial College London

Issued On: 09/05/2025 09:46:44

Pollution Band: Moderate

Details

Sunny on Sunday with temperatures into the mid twenties.

Back trajectories indicate an air feed arriving from high altitude and from over the near continent. This air feed may pick up some particulate pollution along the way, although it's not expected to be significant. In addition a breeze during the day should ensure dispersion of any local emissions.

In strong sunshine and increased temperatures ground level ozone production is expected as these act on local and continental precursor emissions such as oxides of nitrogen, volatile organic compounds and carbon monoxide. As a result 'moderate' ozone is likely.

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.

Outlook

Forecast icon

Issued By:
Environmental Research Group
Imperial College London

Issued On: 10/05/2025 11:47:45

Pollution Band: Moderate

Details

Warm and sunny with some intermittent cloud clearing on Monday, temperatures in the mid twenties.

A continuing easterly air feed from the continent. Although this may pick up some particulate pollution along the way, it's not expected to be significant. A breeze should ensure dispersion of any local emissions.

In strong sunshine and increased temperatures ground level ozone production is expected as these act on local and continental precursor emissions such as oxides of nitrogen, volatile organic compounds and carbon monoxide. As a result 'moderate' ozone is 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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