The Government has warned Londoners to avoid strenuous physical activity on Friday, January 14 due to "very high" levels of pollution.
As reported by The Guardian the poor air quality is the result of an intense area of high pressure covering western Europe.
The associated lack of air movement means emissions from vehicles and other pollutants are not blown away as they usually would be.
Older people and those with lung or heart issues have been advised to avoid strenuous activity altogether.
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