The Met Office is continuing to monitor a plume of sulphur dioxide that passed over Norwich at the weekend. 

The gas was caused by a volcano eruption in south-western Iceland on Thursday, the sixth time the volcano has erupted since December. 

Norwich was one of the cities exposed to the cloud of colourless gas on Sunday with speculation it could cause sickness. 

Symptoms of sulphur dioxide include a sore throat, stomach pain and vomiting if breathed in at high levels. 

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The Met Office confirmed small concentrations of the gas compound in the air over the UK meant pollution should stay low. 

A spokesman said: "Impacts have been low from this sulphur dioxide, as it is high in the atmosphere and is having little influence on ground-level air quality. 

"Small concentrations at surface level mean that the air pollution levels remain low. 

"We are continuing to monitor any sulphur dioxide release originating from Iceland, with current forecasts suggesting little influence on UK surface air pollution in the coming days."