Noise contours on Ordnance Survey (OS) maps 2012.
Gatwick Airport
LGW Actual Modal Split (87% W 13% E) Average Summer Day (0700-2300 BST) Leq Noise Contours
LGW Standard Modal Split (87% W 13% E) Average Summer Day (0700-2300 BST) Leq Noise Contours
Heathrow Airport
LHRActual Modal Split (89% W 11% E) Average Summer Day (0700-2300 BST) Leq Noise Contours
LHR Standard Modal Split (78% W 22% E) Average Summer Day (0700-2300 BST) Leq Noise Contours
Stansted Airport
STN Actual Modal Split (85% SW 15% NE) Average Summer Day (0700-2300 BST) Leq Noise Contours
STN Standard Modal Split (71% SW 29% NE) Average Summer Day (0700-2300 BST) Leq Noise Contours
Noise contour maps 2008-2011 can be found here.