Zero chance of a third runway by 2012. Due to EU NO2 pollution regulations that come into force in 2010, the current levels of NO2 pollution in the LHR
area - from the airport itself and the M4
and M25 motorways - will have to be significantly lower than today (through improved technology?) if the third runway is to be built. If this is achieved the third runway will be a short runway built parallel to and north of the current airport between the A4
road (the main road that runs east-west along the airport's northern boundary - and the M4
that runs east-west to the north of the A4
. It will be used primarily for domestic flights and short haul European flights. This will enable the number of domestic feeder flights (that have significantly declined over the years) to be increased relinking British cities that no longer have flights to LHR
and free slots on the two main runways for more longer haul flights.