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The pain threshold for humans is 120-130 Decibels. Any sound above 85 dB can cause hearing loss, and the loss is related both to the power of the sound as well as the length of exposure.Human speech is only registered at about 25-35 decibels.

A speaker at a rock concert can reach 135-145 decibels. Fireworks are 145-150 decibels. Gunfire is 145-155. NHRA dragsters reach 155-160 decibels. A space shuttle launch is 165-170. The call of a blue whale (largest and LOUDEST mammal on Earth) can reach 188 decibels. In 1883 Krakatoa, the volcano, erupted and the sound was reported at 180 decibels. The sound was heard almost 3,000 miles away. A 1-ton bomb reaches 210 decibels. A 5.0 on the Richter scale earthquake has a decibel level of 235.

The Tunguska event was a massive explosion that occurred near the Podkamennaya (Under Rock) Tunguska River in what is now Krasnoyarsk Krai of Russia, at 7:40 AM on June 30, 1908. The explosion was most likely caused by the air burst of a large meteoroid or comet fragment at an altitude of 5 to 10 kilometers (3-6 mi) above Earth's surface. It was measured with the similar impact of a 1000-Mega-ton bomb with a decibel rating 300-315. This is often considered to be the loudest single-event in history.

That might be the loudest noise ever to be made in the world.

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