Two schools in London are losing their playing fields, after the Education Secretary ignored his independent advisors to push through the closures.
After the Olympics, there is the argument that these playing fields are more important than ever to get children involved in sport.
The Mayor of London says it is vital to protect these areas, but could more than two in the capital be a risk in the future?
Nick Thatcher's report contains flash photography.
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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.