Calculadora de Poluição Sonora — Formula

How to Calculate Noise Pollution

Noise levels are measured in decibels (dB) on a logarithmic scale.

Combining Sources

Combined dB = 10 * log10(10^(dB1/10) + 10^(dB2/10))

Distance Attenuation

dB at distance = Source dB - 20 * log10(distance / reference)

Reference Levels

  • Whisper: 30 dB
  • Conversation: 60 dB
  • Traffic: 70-85 dB
  • Construction: 80-100 dB
  • WHO recommends daytime limit of 55-65 dB

    • Exemplo Resolvido

    A 70 dB traffic noise and 60 dB HVAC system, 8 hours exposure at 50 feet.

    1. Combined: 10 * log10(10^7 + 10^6) = 10 * log10(11,000,000) = 70.4 dB
    2. At 50 ft: 70.4 - 20 * log10(50/3) = 70.4 - 24.4 = 46.0 dB
    3. vs WHO: 46.0 - 65 = -19.0 dB (below limit)