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Index 1990=100<br />

140<br />

120<br />

100<br />

80<br />

60<br />

40<br />

20<br />

0<br />

1990 1993 1996 1999 2002 2005 2008 2011 2014<br />

PM10 PM2.5 Nitrogen oxides Sulphur dioxide Lead<br />

Figure 4.1: UK’s improving air quality picture<br />

Aircraft<br />

type<br />

Population within<br />

60dBA<br />

Households within<br />

60dBA<br />

Airbus A340-600<br />

Boeing B787-9<br />

% Drop<br />

653,100<br />

350,600<br />

-46%<br />

274,800<br />

147,000<br />

-47%<br />

Figure 4.2: Comparison of the population and households affected by noise of older Airbus A340 with newer Boeing B787-9<br />

(Dreamliner) on typical westerly arrivals at Heathrow.<br />

This shows the 60 dBA Lmax noise footprint populations of the labelled aircraft, the level from an individual noise event that<br />

the WHO recommends should be avoided during the night. <strong>The</strong>se figures relate to a specific aircraft on a single flight, in<br />

contrast to the Lden metric, which is a weighted average of all types of aircraft over a 24 hour period. Lden is commonly<br />

reported at 55 dB, whereas plotting Lmax at this level would be unreliable and offer little insight.<br />

11

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