General Knowledge Ecology and Environment Environmental pollution

ధ్వని ఎంత ఎక్కువగా ఉంటే శబ్ద కాలుష్యం సృష్టించబడుతుంది

1
70-75 dB
2
50-60 dB
3
80-99 dB
4
40-65 dB

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