dB (A) "dB (A)" means Decibel-A-weighted, being a unit of measurement of sound level obtained when using a sound level meter corrected to the "A" weighted scale using a reference pressure of 20 micropascals; PU(A) 244/1987 - ENVIRONMENTAL QUALITY (MOTOR VEHICLE NOISE) REGULATIONS, 1987 2. Interpretation.
dB (A) "dB (A)" means Decibel-A-weighted, being a unit of measurement of sound level obtained when using a sound level meter corrected to the "A" weighted scale using a reference pressure of 20 micropascals; PU(A) 244/1987 - ENVIRONMENTAL QUALITY (MOTOR VEHICLE NOISE) REGULATIONS 1987 2. Interpretation