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| {| | | {| |
| |Source Zone |Receiver Zone |Day Hours (7 a.m. - 10 p.m.) |Night Hours (10 p.m. - 7 a.m.) | | |Source Zone |
| | |Receiver Zone |
| | |Day Hours (7 a.m. - 10 p.m.) |
| | |Night Hours (10 p.m. - 7 a.m.) |
| |- | | |- |
| |Residential |Residential |55 dBA |50 dBA* | | |Residential |
| | |Residential |
| | |55 dBA |
| | |50 dBA* |
| |- | | |- |
| |Commercial |Residential |60 dBA |55 dBA* | | |Commercial |
| | |Residential |
| | |60 dBA |
| | |55 dBA* |
| |- | | |- |
| |Industrial |Residential |65 dBA |60 dBA* | | |Industrial |
| | |Residential |
| | |65 dBA |
| | |60 dBA* |
| |} | | |} |
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| ==Daytime hours (7 a.m. to 10 p.m.) ==__NOTOC__
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| ===Home equipment:===
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| '''Indoors:''' Sound must not exceed 60 dBA when measured at the lot line.
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| '''Outdoors:''' Lawnmowers, riding tractors, and small garden tools: Must not exceed 80 dBA, measured at 25 feet or the lot line, whichever is further.
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| '''General sound:''' No specific general limit is provided for daytime hours, but the code states that sound shall not "injure or endanger the safety or health of humans; or annoy or disturb a reasonable person of normal sensitivities".
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| ==Nighttime hours (10 p.m. to 7 a.m.) ==
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| '''General rule:''' No excessive noise is allowed.
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| '''Specifics:''' The code refers to the limits specified in Section 18.10.010 for this time period.
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| '''Amplified sound:''' Sound from devices like speakers is not allowed to be "plainly audible" inside a dwelling unit during these hours.
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| ==Other considerations==
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| '''Impulsive sound:''' Peak sound pressure levels cannot exceed 100 dB during the day and 80 dB at night, according to Noise Free America.
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| '''Land use zones:''' Limits can vary based on the zone (residential, commercial, industrial). For instance, the standard is 65 dBA for a commercial/mixed-use zone and 70 dBA for an employment or industrial zone when measured at the lot line of a dwelling unit, as stated in City of Portland, Oregon code.
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| '''Enforcement:''' The city's noise code (Title 18) is used to address a wide range of issues, including those from amplified sound, commercial and industrial operations, home equipment, and construction.
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| '''Leaf blowers:''' There are separate regulations for leaf blowers that are not covered under the general home equipment rules.
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Maximum Permissible Sound Levels
The general sound levels in Portland, as measured at the property line of the receiving property, are as follows:
| Source Zone
|
Receiver Zone
|
Day Hours (7 a.m. - 10 p.m.)
|
Night Hours (10 p.m. - 7 a.m.)
|
| Residential
|
Residential
|
55 dBA
|
50 dBA*
|
| Commercial
|
Residential
|
60 dBA
|
55 dBA*
|
| Industrial
|
Residential
|
65 dBA
|
60 dBA*
|