Crystal Watts and Chelsea Hutt, both aged 15 from Blackbird Leys, were last seen on Thursday at their homes.
Crystal is slim, around 5ft and has highlighted hair. Chelsea is around 5ft 5ins, with shoulder length dark brown hair. She was last seen wearing a black and white coat with a fur hood, a grey hooded jumper with a brown handbag and a coloured bag on her back.
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Thursday evening's weather for the west of the region
Thursday evening's weather for the east of the region
In our special series, we investigate the ways in which we can all breath in less Black Carbon, decreasing the chances of health risks: