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According the the Environmental Protection Agency - EPA - the Day-Night Sound Levels - Ldn - and the Equivalent Sound Level - Leq - should not exceed certain limits to protect public health and welfare.
Values that should not be exceeded can be found from the table below:
| Effect | Level | Area |
| Hearing | Leq(24) < 70 dBA | All areas at the ear |
| Outdoor activity interference and annoyance | Ldn < 55 dBA | Outdoors in residential areas and farms where people spend varying amounts of time in which quiet is a basis for use |
| Outdoor activity interference and annoyance | Leq(24) < 55 dBA | Outdoor areas where people spend limited time such as school yards playgrounds, etc. |
| Indoor activity interference and annoyance | Ldn < 45 dBA | Indoor residential areas |
| Indoor activity interference and annoyance | Leq(24) < 45 dBA | Indoor areas with human activities such as schools, etc. |
Note! To protect against hearing damage, one's 24-hour noise exposure at the ear should not exceed 70 dB.
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