Noise is everywhere! It is estimated that possibly as many as 30 million Americans work in hazardous noise on a daily basis. Extra-curricular activities and hobbies such as concerts, race cars, motorcycles, snowmobiles, power tools, lawn mowers, snow blowers, etc. all compound our exposures outside of work. This constant stimulation leaves us (and our ears) with very little quiet time in our lives. This quiet time is essential in the conservation of our hearing.
A good rule of thumb is that if you must shout over a noise to be heard by a person standing at arms length, you should be wearing hearing protection.