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Public Health England (PHE) scientists issue advice for parts of England and Wales.
In the last few days a combination of local emissions, light winds, pollution from the continent and dust blown over from the Sahara caused a spike in the UK Air Quality Index compiled by the Department for Environment, Food and Rural Affairs (Defra).
And those higher than usual levels of pollution may bring on health effects in some.
See the Public Health England (PHE) website for further details on the advice issued.