Behind the scenes at an air quality monitoring station

Air quality monitoring stations across the UK measure particles of dust in the air that can be breathed into the lungs.

ITV News Correspondent Rupert Evelyn visited a monitoring station in King's Lynn in Norfolk:

Health manager Dave Robson of King's Lynn and West Norfolk Council told ITV News the levels at the local station were "above what we'd normally see".

High pollution levels hit parts of the UK: Are you at risk?

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High levels of pollution expected to clear

Air pollution levels remain high across parts of England and Wales but are expected to reduce later today. The South East and Greater London are still experiencing "high" levels of pollution, Defra warns.