Sound becomes "dangerously loud" at levels that can cause Noise-Induced Hearing Loss (NIHL), which is generally defined as prolonged exposure to sounds at or above 85 decibels (dB). To put this in perspective, a normal conversation is about 60–70 dB, which is perfectly safe. However, a gas-powered lawnmower or a leaf blower (approx. 90 dB) can cause damage after just two hours of exposure. As the decibel level increases, the "safe" time drops dramatically: a rock concert or a sporting event (105–110 dB) can cause permanent damage in as little as 5 to 15 minutes. Any sound at 140 dB or higher, such as a firecracker or a jet engine at close range, can cause immediate, irreversible hearing loss and physical pain. In 2026, health experts emphasize the "60/60 rule" for headphones: listen at no more than 60% volume for no more than 60 minutes a day to stay below the danger zone and prevent the onset of early-onset tinnitus.