A major investment in London roads is expected to be announced today when Transport for London unveils its business plan.
Funding is expected to be focused on some of the capital's busiest intersections, like Kings Cross and the Hammersmith Flyover.
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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.