Today marks 10 years since the Bali bombings.
202 people, including 28 Britons, were killed in October 2002 when a terror group launched an attack on two nightclubs packed with tourists.
Special ceremonies will be held to mark the anniversary in Bali and in London today.
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Official readings are recorded three metres in the air but a study found levels of nitrogen dioxide (NO2) were higher at pushchair level.
Tubes, trains, trams, buses, cable cars, river buses, taxis and going by foot - your guide to getting around during the strike.
Union officials rejected a revised offer from Underground managers during a meeting at the conciliation service ACAS this afternoon.