If approved, Heathrow's charges will increase from the equivalent of £19.33 per passenger for 2012/13 to as much as £27.30 in 2018/19.
Year by year breakdown:
2012/2013 - £19.33 per passenger
2013/2014 - £20.78 per passenger
2014/15 - £21.96 per passenger
2015/16 - £23.25 per passenger
2016/17 - £24.50 per passenger
2017/18 - £25.81 per passenger
2018/19 - £27.30 per passenger
More top news
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.