Tower Bridge emerging through London's smog on a day of record pollution due to a combination of traffic fumes, relatively still weather and an influx of dirty air from the north of England and northern France. Poor air quality has been linked to nearly one in five deaths a year in London. The capital’s poor air quality, caused largely by traffic, has seen the UK facing £300m in fines for breaching EU targets. The bridge built in 1894 is 800 feet (244 m) in length with two towers each 213 feet (65 m) high, built on piers. The central span of 200 feet (61 m) between the towers is split into two equal bascules or leaves, which can be raised to an angle of 83 degrees to allow river traffic to pass.