Forecast
Air Pollution Forecast from Imperial College London Environmental Research Group
Today
Issued:
19/06/2025 09:49:52
Pollution Band:
Moderate
Details
Warm and sunny on Thursday with a high pressure system firmly established over the UK. Temperatures are forecast to reach 30C by evening.
Air arriving may pass close to the near continent briefly before arriving from the east, however it will have originated in the Atlantic and so is expected to be relatively 'clean'. There is likely to be poor dispersion during the day with little wind activity, allowing some build-up of local emissions. Any build-up is expected to clear by evening as a breeze picks up.
Ground-level ozone is formed in the atmosphere through complex reactions between precursor pollutants such as nitrogen oxides (NOx), volatile organic compounds (VOCs), and carbon monoxide (CO), under the influence of heat and ultraviolet (UV) radiation from sunlight. As a result 'Moderate' ozone levels are expected as sunshine and high temperatures act on local pollution during the day.
Air pollution is expected to remain 'Low' for the following pollutants:
PM10 Particulates
PM2.5 Particulates
Nitrogen Dioxide
Sulphur Dioxide
Outlook
Issued:
19/06/2025 09:51:31
Start:
Friday 20 June
Finish:
end of Friday 20 June
Pollution Band:
Moderate
Details
Warm and sunny on Friday with a high pressure system centered to the east of the UK. Temperatures are forecast to reach into the high 20s, possibly 30C by evening.
The air feed will have originated in the Atlantic before looping back around, passing over the near continent and then arriving from the east. It is expected to be relatively 'clean' due to its Atlantic origin. Although, some pollution may be present due to the brief time spent passing over urban and industrial sources on the near continent, in addition to London's own emissions. A light breeze during the day should help to disperse local emissions.
Ground-level ozone is formed in the atmosphere through complex reactions between precursor pollutants such as nitrogen oxides (NOx), volatile organic compounds (VOCs), and carbon monoxide (CO), under the influence of heat and ultraviolet (UV) radiation from sunlight. As a result 'Moderate' ozone levels are likely as sunshine and high temperatures act on any pollution present during the day.
Air pollution is expected to remain 'Low' for the following pollutants:
PM10 Particulates
PM2.5 Particulates
Nitrogen Dioxide
Sulphur Dioxide
The Ealing 8 monitoring site on Horn Lane, Acton forms part of an investigation of the local PM10 sources at this location. The site is affected by specific local sources of PM10 particulate and it is not representative of other areas within the Borough. Horn Lane will have increased levels of particulate matter that will not be representative of rest of the borough.
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.
Health Advice
| 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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