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Issued By:
Environmental Research Group
King's College London

Issued On: 26/05/2017 12:14:00

Pollution Band: Moderate

Details

Some uncertainty exists in the current weather forecast associated with a change over the weekend from hot weather off the continent to cooler weather circulating in from the Atlantic.

Warm air coming in off the continent and mainly sunny conditions on Saturday brings the possibility of ‘Moderate’ ozone across London during the afternnon/evening in locations away from busy roads as emissions drift and react in the strong sunlight. On Sunday there remains the chance of ‘Moderate’ ozone but is less likely since a change in air path and possible thunderstorms are expected in the afternoon. Thunderstorms can, however, be associated with bringing high-level ozone down to ground level so we may see some spikes in ozone associated with this.

From late Sunday onwards slightly cooler, more overcast conditions are expected with air off the Atlantic, and this should limit the generation of ozone.

Winds are expected to be gusty throughout the forecast period and will help disperse local emisssions.

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.

Outlook

Forecast icon

Issued By:
Environmental Research Group
King's College London

Issued On: 26/05/2017 12:14:00

Start: Saturday 27 May

Finish: end of Sunday 28 May

Pollution Band: Moderate

Details

Some uncertainty exists in the current weather forecast associated with a change over the weekend from hot weather off the continent to cooler weather circulating in from the Atlantic.

Warm air coming in off the continent and mainly sunny conditions on Saturday brings the possibility of ‘Moderate’ ozone across London during the afternnon/evening in locations away from busy roads as emissions drift and react in the strong sunlight. On Sunday there remains the chance of ‘Moderate’ ozone but is less likely since a change in air path and possible thunderstorms are expected in the afternoon. Thunderstorms can, however, be associated with bringing high-level ozone down to ground level so we may see some spikes in ozone associated with this.

From late Sunday onwards slightly cooler, more overcast conditions are expected with air off the Atlantic, and this should limit the generation of ozone.

Winds are expected to be gusty throughout the forecast period and will help disperse local emisssions.

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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