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@Jonny69
In central London, the smog might be an effect of the increased sunshine. Back in the day when I was at university studying environmental stuff, there was a known smoggy hotspot around Docklands where the wind never carried away the pollution and it kind of sat there in a cloud. When strong sunshine passed through it, the UV would create ground level ozone from the unburned hydrocarbons etc. Photochemical smog. It was always likened to how it occurs in Mexico City. People only doing short car journeys to the supermarket is going to create all the ideal ingredients for it.