Forecast
Air Pollution Forecast from Imperial College London Environmental Research Group
Today
Issued:
08/07/2025 11:46:21
Pollution Band:
Low
Details
A hot sunny day on Wednesday with a high pressure system centered just to the south west of the UK.
A relatively 'clean' air feed from the Atlantic is not expected to contain any significant pollution and a light breeze should also prevent build-up of local emissions.
Increased ground level ozone formation is expected, mostly as locally emitted pollutants react photochemically in strong sunshine and warm temperatures. However, some forecasted cloud cover later in the day and a relatively 'clean' airfeed, should ensure that overall ozone levels remain 'Low'. The national Daily Air Quality Index for ozone is measured on a running 8 hour mean.
Air pollution is expected to remain 'Low' for the following pollutants:
PM10 Particulates
PM2.5 Particulates
Nitrogen Dioxide
Ozone
Sulphur Dioxide
Outlook
Issued:
08/07/2025 11:57:33
Start:
Thursday 10 July
Finish:
end of Thursday 10 July
Pollution Band:
Moderate
Details
A hot sunny day with temperatures forecast to reach thirty degrees.
A relatively 'clean' air feed from the Atlantic early on, slower moving in the afternoon having travelled at low altitude over the UK with some circulation over the London area. There is likely to be some pollution associated with this latter route.
Increased ground level ozone formation is expected as any pollution present reacts photochemically in strong sunshine and warm temperatures. As a result 'Moderate' ozone levels are forecast.
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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