Draft agglomerations noise action plan: consultation

Annex E: Glossary

Agglomeration: An urbanised area having a population in excess of 100,000 people and a population density equal to or greater than 500 people per km2

dB(A): A measure of sound pressure level (“A” weighted) in decibels as indicated by a sound level meter which complies with British Standard BS EN 61672-1:2013 – Electroacoustics – Sound Level Meters – Part 1 Specifications.

LAeq,T: The A-weighted equivalent continuous sound pressure level which is a notional continuous level that, at a given position and over the defined time period, T, contains the same sound energy as the actual fluctuating sound that occurred at the given position over the same time period, T

Lday: The LAeq over the period 0700 – 1900, local time (for strategic noise mapping this is an annual average) Levening The LAeq over the period 1900 – 2300, local time (for strategic noise mapping this is an annual average)

Levening: The LAeq over the period 1900 – 2300, local time (for strategic noise mapping this is an annual average)

Lnight: The LAeq over the period 2300 – 0700, local time (for strategic noise mapping this is an annual average)

Lden: The LAeq over the period 0000 – 2400, but with the evening values (1900 – 2300) weighted by the addition of 5 dB(A), and the night values (2300 – 0700) weighted by the addition of 10 dB(A) (for strategic noise mapping this is an annual average)

Major airport: A civil airport having more than 50,000 movements per year (a movement being a take off or a landing) excluding those purely for training purposes on light aircraft

Major road: A road having more than 3 million vehicle passages per year which is–

(a) designated by the letter “A” followed by a number; or

(b) a special road within the meaning of section 7 of the Roads (Scotland) Act 1984

Major railway: A railway having more than 30,000 train passages per year