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Pollution levels exceeded the legal limit in four out of 10 UK councils in 2015, according to data collected from local monitoring stations.

Across the country, 169 local authorities were found to have gone over annual EU limits on nitrogen dioxide, primarily because of heavy traffic on the roads.

Nitrogen dioxide, an invisible gas, is emitted by vehicles, particularly cars and vans with diesel engines, and is linked to lung disease and cardiovascular problems such as heart attacks and strokes.