Forecast

Today

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Issued: 16/01/2017 12:00:00

Pollution Band: Moderate

Details

With an area of high pressure becoming established over the near-continent, cold and settled conditions are expected in Greater London during Tuesday.

Light winds and low temperatures throughout the day will inhibit the dispersal of locally-emitted pollutants. Consequently, 'Moderate' levels of PM10 & PM2.5 particulates and nitrogen dioxide are likely close to busy roads.

Air mass back trajectories indicate that, for at least some of Tuesday, air arriving in Greater London will have passed over the industrialised region of Nord-Pas de Calais in north-western France. London's local pollution burden is therefore likely to be exacerbated by some imported PM10 and PM2.5 particulates. However, should this incoming feed of polluted air become more prolonged and established than is currently predicted, 'Moderate' levels of PM10 and PM2.5 particulates may also occur widely at urban background locations.

Air pollution is expected to remain ‘Low’ throughout the forecast period for the following pollutants:

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: 17/01/2017 11:53:00

Start: Wednesday 18 January

Finish: end of Wednesday 18 January

Pollution Band: Moderate

Details

With an area of high pressure becoming established over the near-continent, cold and settled conditions are expected in Greater London.

Light winds and low temperatures throughout the day will inhibit the dispersal of locally-emitted pollutants. Consequently, 'Moderate' levels of PM10 & PM2.5 particulates and Nitrogen Dioxide are likely close to busy roads.

Air mass back trajectories indicate that, for at least some of Wednesday, air arriving in Greater London will have passed over the industrialised region of North-Western France.
London's local pollution burden is therefore likely to be exacerbated by some imported particulates. However, should this incoming feed of polluted air become more prolonged and established, 'Moderate' levels of PM10 and PM2.5 particulates may also occur widely at urban background locations.

Air pollution is expected to remain ‘Low’ throughout the forecast period for the following pollutants:

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.

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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