Forecast

Today

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Issued By:
Environmental Research Group
King's College London

Issued On: 25/05/2017 08:58:00

Pollution Band: Moderate

Details

*Updated 10:00 25/05*

Cloud cover which was expected today is now no longer forecast. A full day of unbroken sunshine is now forecast with temperatures reaching the mid-twenties.

A full day of strong sunshine starting with clear skies from early morning are conditions which typically allow for the generation of ground-level ozone as the sun acts on nitrogen dioxide and other ozone pre-cursor emissions.

It is likely therefore that ozone will reach 'Moderate' by the afternoon.

Peak ozone levels tend to be seen away from roadside locations as emissions drift and react in the sun.

Levels of other pollutants should remain 'Low' through the forecast period.

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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
King's College London

Issued On: 25/05/2017 09:51:00

Start: Friday 26 May

Finish: end of Friday 26 May

Pollution Band: Moderate

Details

Friday is due to be another day of strong, unbroken sunshine with temperatures again reaching the mid-twenties.

Photochemical production of ozone is likely in these conditions, particularly away from roadside locations as precursors, such as nitrogen dioxide, drift and react in the sun. 'Moderate' levels of ozone are expected.

Air trajectories show the air feed originating from the west, but swirling around to give an eastward breeze. There is a possibility that some emmisions will be imported, but not at levels or for the duration required for 'moderate' particulates to be recorded.

Pollution levels are expected to remain 'Low' for the following pollutants during the forecast period:

Nitrogen Dioxide
PM10 particulates
PM25 particulates
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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