© Licensed to London News Pictures. 26/02/2019. London, UK. Smog is seen over the skyline of London at sunset last night, following days of unseasonably warm weather in the capital. Temperatures on Tuesday 26 February reached 20.8C in Porthmadog, north-west Wales, which was the warmest winter day on record. Sadiq Khan, the Mayor of London, has announced a high alert for air pollution in the capital. Photo credit : Tom Nicholson/LNP
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