By Thomas Moore, Health and Science Correspondent
The elderly and people with health problems have been warned to avoid strenuous activity because of harmful levels of air pollution expected to blanket parts of the UK.
The warning comes as forecasters say Britain could enjoy the hottest day of the year so far, with parts of eastern England predicted to reach highs of 22C (71.6F).
Eastern, central and southern England are forecast to be affected by "high" pollution today.
Parts of East Sussex and west Kent are expected to reach "very high" levels, according to the Government's UK-Air monitoring service.
The high levels are due to domestic soot particulates, combined with dirty air from the Continent and some Saharan dust.
With the fine, settled weather conditions the pollution will be trapped over the UK for several hours.
Dr Sotiris Vardoulakis, head of the air pollution group at Public Health England, said: "While most people will not be affected by short term peaks of air pollution, some individuals, particularly those with existing heart or lung conditions, may experience increased symptoms."
Dr Vadoulakis said in areas with very high pollution levels people should reduce physical exertion if they develop a cough or sore throat.
He added: "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."
Winds are expected to pick up in the early hours of Saturday morning, bringing fresher air to all parts of the country.
Dr Samantha Walker, director of research and policy at Asthma UK, said: "Two thirds of people with asthma find that air pollution makes their asthma worse, putting them at an increased risk of a potentially fatal asthma attack.
"When air pollution is high it's vital people with respiratory conditions, including asthma, check air pollution forecasts, carry their reliever inhaler with them at all times, and ensure that they are taking their preventer inhaler every day because this will help build resilience to asthma triggers like air pollution."
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Gallery: Worst Ten UK Cities For Air Pollution
Nottingham is joint top of the list, with a PM10 level of 25. The WHO say most cities across the world are failing to meet safe levels for outdoor pollution
Thurrock is also joint top with a level of 25.
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