The soup kitchen putting London's air quality on the menu

Free colour-coded menu is changed daily according to air pollution levels at pop-up scheme that aims to raise awareness of problem“I see the air is good today,” says the security guard, as he sips his cup of bright green pea soup. “I can tell by the flavour.”
Staff and visitors here at the central London headquarters of the Royal Institute of British Architects (Riba) have been treated to daily free soup from the Pea Soup House, a pop-up installation in the lobby that ser