A woman wearing a protective hygiene (pollution) face mask on the London Underground subway system, London, England, United Kingdom, Europe

photography vertical color image travel destinations travel london capital cities england uk underground rail railroad station transportation focus on foreground selective focus outdoors one person people 50 54 years mature adult mature women one mature woman only only women adult sitting backpack hygiene mask bench sign text adults person mature woman middle aged woman middle aged woman middle aged women middle aged women woman women female females one person only 1 person 1 person only outdoor outside travel destination tourist destination tourist destinations