The 'traffic noise' near highways is primarily characterised by its:
Choose the correct answer
Only frequency in Hz (not dB)
Equivalent continuous sound level Leq in dB(A) — A-weighted to match human hearing sensitivity
Vibration amplitude in mm
Distance from source to observer only
Correct Answer
B. Equivalent continuous sound level Leq in dB(A) — A-weighted to match human hearing sensitivity
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Traffic noise: measured in dB(A) (A-weighted, mimics human hearing). Equivalent continuous sound level Leq over a reference period (day: 6 AM–10 PM; night: 10 PM–6 AM). L10 (exceeded 10% of time) for peak; L90 for background. CPCB/NPCB standards: residential areas day 55 dB(A), night 45 dB(A). Noise barriers and plantations reduce levels 5–15 dB(A).
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