Target 2008: To improve Auxillary Power Unit (APU) compliance as measured by turn around audits by 10% from the 2007 baseline of 65%.

Our modelling estimates that aircraft activities are responsible for 56% of NOx emissions at Heathrow, and of this APUs are responsible for 18% of NOx emissions from aircraft. Therefore, we have decided to concentrate the target on improving the compliance of APUs with our airport procedures from the baseline established during 2007.

However, a lack of airline confidence in its ability to support all the in-flight management systems, often results in it being used alongside APUs. Our longer term objective is to restrict the use of APUs in line with upgrading the output of the FEGP from 90kVa to 150/180kVa on stands used by wide bodied aircraft.

We also remain committed to progressing our air quality programme. This includes:

• Implementing the actions in the 2007-2011 action plan that we have committed to implement in 2008
• Continuing to chair the Heathrow Air Quality Working Group, attended by our neighbouring local authorities and British Airways
• Continuing to run our air quality monitoring programme and provide results to our neighbouring local authorities. This includes the integration of two air quality monitoring sites set up to monitor air emissions from the Terminal 5 construction site into the permanent BAA Heathrow air quality monitoring programme
• Continuing to support the Heathrow Airwatch website
• Continuing to run the Clean Vehicles Programme and implementing changes to ensure that the programme is resulting in improvements in the NOx and CO2 emissions from members of the scheme.

Issues and approach
Our performance