FAQ Answer
FAQ Answer
What do aircraft noise exposure contours show?
They depict lines joining points of equal noise exposure (frequently measured in Leq), like the lines joining points of equal height on an Ordnance Survey map.
Environmental Factors
- How do I make a complaint about aircraft noise?
- What is a decibel?
- What does the ‘A’ in the dBA unit mean?
- What is Leq?
- If the number of aircraft noise events is doubled, the noise level only increases by 3 dBA, why?
- What do aircraft noise exposure contours show?
- How are noise contours produced?
- Are there other noise models available, and are they the same as ANCON?
- Why is the 57 dBA contour considered important?
- I live outside the published 57 dBA contour and I am overflown; I can hear aircraft and it annoys me - how is this possible?
- What is Lden?
- How is helicopter noise modelled?
- What are the 'Chapter 2' and 'Chapter 3' aircraft noise classifications?
- What is the new 'Chapter 4' noise standard?
- How do I purchase the latest annual contour reports for Heathrow, Gatwick and Stansted?
- How do I purchase other reports produced by ERCD?
