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The south east and Greater London are currently experiencing "very high" levels of pollution, Defra has warned.
Eastern England has been hit with "high" pollution levels so far this morning, Defra's Air Quality Index showed at 9am.
People with health problems should reduce strenuous outdoors exertion in light of high pollution levels in London, the Department for Environment, Food and Rural Affairs have warned.
Advice on the Defra's website says:
Health warnings have been issued as "high" levels of pollution spread across southern England.
Large parts of southern England have "high" levels of pollution, with some parts "very high", this morning's forecast said.
The increased pollution levels have been caused by a combination of light south-easterly winds, the continental air flow and dust which has blown up from the Sahara desert.
Asthmatics have been told they may need to use their blue reliever inhalers more often over the next few days, while people with lung and heart problems have been told to avoid strenuous exercise.
Latest ITV News reports
Boris Johnson was accused of "dangerous complacency" after urging Londoners to "keep a sense of proportion" over the pollution scare.
Pollution levels in London are 'high' today according to the Government and the Met Office but what is causing the increase?