Heavy air pollution alerts will remain in place over the weekend after Mayor of London, Sadiq Khan raised the alarm on Thursday (January 19).
Westminster is on "high" alert along with other west London boroughs including Hammersmith and Fulham , Kensington , Hounslow and Chelsea .
London Mayor, Sadiq Khan said: "London’s dirty air is a public health emergency.
"We will continue to use all the technology at our disposal to inform Londoners about levels of air pollution in their neighbourhoods."
Those with breathing difficulties have been warned to stay indoors as much as possible.
However, it will be tempting to head outside as the weather is looking bright this weekend, just try to avoid those boroughs with "high" air pollution.
Temperatures will plummet overnight this weekend, but it will be sunny and dry in London.
For tonight, Friday January 20, the Met Office forecast for London and the south east England says: "Mostly clear and cold with winds remaining light and a widespread frost.
"Areas of mist and freezing fog will develop in places."
Temperatures will plummet to -1°C overnight, so motorists should take care on the roads.
And on Saturday, January 21, the forecast is "a mostly bright, frosty start with fog patches slowly clearing."
Cloud will gradually arrive through the afternoon although it will remain dry.
Temperatures in the capital will only reach highs of around 4°C however, so if you are heading outside to enjoy the sunny and dry weather over the weekend, make sure you wear an extra layer and don't leave without your hat and gloves.
Sunday, January 22 is looking similar, although there will be some patchy cloud around, still feeling very cold though with highs of just 5°C, dropping to -1°C overnight.
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