Can one firecracker damage your hearing?

This is not a seasonal exaggeration. A firecracker is impulse noise: a blast, not a raised voice. The ear can forgive a loud room for a while. It does not get the same grace from an explosion beside the head. People walk away thinking the ringing is temporary. Sometimes it is. Sometimes it is the first report of an injury.

How loud a firecracker actually is

Ordinary speech sits around 60 to 70 decibels. Prolonged sound around 85 decibels is where workplace rules start to worry about hours of exposure. A firecracker is not that problem. It is a peak. Measured close to the blast, some fireworks reach about 140 to 160 decibels, and figures around 150 decibels a metre from the source are quoted by hearing organisations. Impulse noise above about 140 decibels can injure the inner ear almost at once.

Decibels are not a polite scale. A small step up is a large step in energy. Standing a little nearer is not a little louder. The type of cracker, the distance, and the walls around a courtyard all change the number. There is no single distance that is safe for every cracker in every lane.

What the blast does inside the ear

Sound becomes hearing in a field of hair cells in the cochlea. Those cells do not grow back. A blast can bend or break them. The result may be a dull ear, a missing band of pitches, or a sound that stays after the cracker has not: tinnitus. The same pressure wave can tear the eardrum or disturb the chain of tiny bones behind it. Pain, blood, fluid, or a spinning feeling are reasons to stop guessing.

A muffled ear that recovers over minutes can be a temporary threshold shift. Recovery is not proof that nothing happened. Repeated blasts, or one very close blast, are how a temporary muffling becomes a permanent notch in the hearing. Hearing loss and tinnitus have their own guides. A cracker is one way to arrive at either.

Ringing after a cracker is a warning

Tinnitus after a loud blast means the inner ear was overloaded. It may fade overnight. If it is still there the next day, or if hearing in that ear is down, treat it as an injury to be measured, not a story to tell at lunch. Sudden hearing loss is time-sensitive. The separate guide on sudden hearing loss explains why the first day matters.

How to protect hearing this Diwali

• Distance first. If the blast is uncomfortable, you are too close. Do not lean over a cracker, and do not let one off beside someone’s head.
• Use real hearing protection when you cannot leave the noise: foam earplugs rolled small and held while they expand, or earmuffs that seal. Cotton wool barely reduces the peak.
• Children need a further line and protection that fits. A child will not reliably move away, and a child’s ear is not a tougher version of an adult’s.
• Earplugs are not permission to stand closer. If it is still painfully loud with them in, move.
• Give the ears quiet between bursts. Another hour of speakers after the crackers is more load, not a rest.

What to do if a cracker went off too close

Leave the noise. Do not put oil, drops, cotton buds or water in the ear. If there is blood or fluid, keep the ear dry and do not try to clean it. Pain, dizziness, bleeding, a sudden drop in hearing, or ringing that persists should be examined. For a clear drop in hearing, the same day is the right day. Call the clinic, or go to an emergency department if it is closed. A hearing test shows what the blast took. Waiting to see if it “pops” can spend the window in which some inner-ear injuries are treated.