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As per the Environment Protection Act, 1986, what are the permitted noise limits (in decibel) for the silence zone during day time and night time?
50 and 40, respectively
50 and 60, respectively
40 and 30, respectively
60 and 50, respectively
50 and 40, respectively
Under the Noise Pollution (Regulation and Control) Rules, 2000, framed under the Environment (Protection) Act, 1986, the Central Pollution Control Board (CPCB) has defined noise limits for various zones. For silence zones, which comprise areas up to 100 meters around hospitals, educational institutions, and courts, the prescribed limit is 50┬аdB(A) during the day and 40┬аdB(A) during the night.
Noise Pollution (Regulation and Control) Rules, 2000 (Schedule)
Under the Noise Pollution (Regulation and Control) Rules, 2000, framed under the Environment (Protection) Act, 1986, the Central Pollution Control Board (CPCB) has defined noise limits for various zones. For silence zones, which comprise areas up to 100 meters around hospitals, educational institutions, and courts, the prescribed limit is 50┬аdB(A) during the day and 40┬аdB(A) during the night.
LpтАЛ=20log10тАЛ(p0тАЛpтАЛ) тАФ where LpтАЛ is the sound pressure level in dB, p is the rms sound pressure, and p0тАЛ is the reference sound pressure (20╬╝Pa).
The principle of noise limits is based on acoustic impact assessment where daytime is defined as 6:00┬аAM to 10:00┬аPM and nighttime as 10:00┬аPM to 6:00┬аAM. The limit is measured using an A-weighted decibel scale, represented as dB(A), which approximates the frequency response of the human ear.
Daytime: 6:00┬аAM to 10:00┬аPM
Nighttime: 10:00┬аPM to 6:00┬аAM
Silence zone includes areas around hospitals, schools, and courts.
The limit is based on A-weighted frequency weighting to simulate human auditory sensitivity.
Protection of sensitive ecosystems and human health.
Standardized regulation for urban planning and industrial activity.
Difficulties in continuous monitoring in uncontrolled urban environments.
Enforcement challenges during festive seasons and social events.
Urban planning and zoning regulations.
Environmental Impact Assessment (EIA) for infrastructure projects.
Industrial zone limits: 75┬аdB(A) (Day), 70┬аdB(A) (Night).
Commercial zone limits: 65┬аdB(A) (Day), 55┬аdB(A) (Night).
Residential zone limits: 55┬аdB(A) (Day), 45┬аdB(A) (Night).
Option B, C, and D are incorrect based on the CPCB schedule.
A is correct тАФ The noise limits for silence zones under the Environment Protection Act, 1986, are strictly 50┬аdB(A) for daytime and 40┬аdB(A) for nighttime.
Always remember that silence zones have the lowest permissible noise limits across all categories in the CPCB standards.
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