Noise pollution is excessive noise harmful to humans and wildlife. Human hearing ranges from 0 to 140 decibels. Noise above 85 decibels becomes harmful for ears. WHO recommends 50 decibels for residential areas
Sound level meter measures acoustic parameters using microphone. Condenser microphone provides best precision and stability. Sound pressure converted to electrical signal in decibels. Reference pressure set at 20 micropascals for airborne sound
Noise pollution is unwanted sound affecting human health and wildlife. Sound is measured in decibels (dB) with human hearing range from 0 to 140 dB. Ambient noise levels vary from 35 dB in libraries to 105 dB in construction. Sound intensity increases logarithmically with each dB increase
Sound-proofing your home helps reduce noise and improve sleep quality. Install acoustic foam panels, blankets, or books to absorb sounds. Place noisy appliances away from sleeping areas. Consider using earplugs or noise-canceling headphones for temporary relief
Oceans absorb 25% of man-made carbon emissions, causing rapid acidification. Ocean pH has increased 30% since industrial revolution. Acidic waters threaten marine life and coastal economies. U.S. shellfish industry could lose over $400 million by 2100
Before 1972, oceans were polluted with trash and chemicals without regulation. London Convention (1975) and Protocol (2006) established marine protection standards